Why Do People Cheat? What Research Says About Infidelity

People cheat for many reasons, and research does not support one simple explanation such as “men want sex” or “women want attention.” Infidelity can involve sexual desire, low commitment, anger, lack of love, neglect, validation, novelty, opportunity or several motives at once. Understanding those motives can help explain behavior, but it does not excuse breaking an agreed relationship boundary.

What Counts as Cheating?

Infidelity is behavior that violates the romantic or sexual boundaries a couple has agreed to, explicitly or implicitly. For one couple, kissing another person may be cheating. Another couple may allow outside sexual partners but consider secret emotional intimacy or hidden dating-app activity a violation.

That is why “cheating” depends partly on the agreement. Consensual non-monogamy is not cheating when everyone involved understands and agrees to the relationship structure.

Why Do People Cheat? What Research Finds

A study of 495 people who reported infidelity identified multiple distinct motivations, including anger, sexual desire, lack of love, low commitment, esteem or validation, sexual variety, neglect and situational factors. That matters because it pushes back against the idea that every affair is caused by one unhappy relationship problem.

1. Low Commitment

Some people cheat because they are not strongly invested in preserving the current relationship. They may still enjoy parts of the relationship while feeling less committed to its exclusivity.

2. Lack of Love or Emotional Disconnection

Feeling emotionally detached can be one motive. That does not mean the betrayed partner caused the infidelity. The person who cheats still chooses how to respond to dissatisfaction.

3. Neglect or Unmet Relationship Needs

Some people describe feeling ignored, lonely or disconnected and seek attention elsewhere. Again, unmet needs can explain context without making secrecy or deception inevitable.

4. Anger or Revenge

Infidelity can be retaliatory, especially after conflict or a previous betrayal. Revenge may briefly feel powerful, but it usually adds another injury rather than repairing the first one.

5. Sexual Desire or Variety

Some people want sexual experiences, novelty or partners they do not have in their current relationship. Sexual incompatibility can be difficult, but the ethical options remain communication, renegotiation or leaving, not secret behavior.

6. Validation and Self-Esteem

Attention from someone new can feel affirming. Research has identified esteem-related motives among people reporting affairs, including wanting to feel attractive or increase status.

7. Situational Opportunity

Some infidelity happens in situations where opportunity, lowered inhibition or alcohol plays a role. An opportunity does not remove responsibility, but it helps explain why not every affair reflects the same long-term motivation.

Do Men and Women Cheat for Different Reasons?

Population studies sometimes find average gender differences, but those averages do not let you predict one person’s motives. Men and women can cheat for sexual, emotional, situational or self-esteem reasons. Gender stereotypes often hide more than they explain.

If you are trying to understand a specific betrayal, ask what happened in that relationship rather than assuming the answer from gender.

Does Boredom Cause Cheating?

Boredom or desire for novelty can contribute for some people, but boredom does not mechanically produce infidelity. Plenty of people feel sexually bored and respond by communicating, changing routines, using sex toys for couples, discussing fantasies or ending the relationship.

Novelty can improve a couple’s sexual life, but it cannot “cheat-proof” a relationship because infidelity is not caused by a shortage of positions or toys.

Can Better Sex Prevent Infidelity?

Good sexual communication can improve relationship satisfaction, but no sexual technique can guarantee fidelity. A person may cheat in a relationship they describe as satisfying, and another person may remain faithful in a relationship with serious sexual problems.

If you want more variety, discuss it directly. Our guides to common sexual fantasies, roleplay ideas and tantric sex can provide conversation starters, not guarantees.

Can You Prevent a Partner From Cheating?

You cannot control another adult’s choices. What you can do is create clear agreements, talk about problems earlier and decide what you will do if boundaries are broken.

Define the Boundary

Do not assume both people define cheating the same way. Discuss physical contact, sexting, dating apps, ex-partners, private messages, pornography and any form of non-monogamy that may matter to you.

Talk About Dissatisfaction Before It Becomes Secrecy

Relationship or sexual dissatisfaction deserves a conversation, even if the conversation is uncomfortable. If the mismatch cannot be solved, honest separation is less damaging than secret parallel relationships.

Consider Therapy When Patterns Are Stuck

Couples therapy can help when communication repeatedly collapses, resentment is entrenched or a previous betrayal has not been resolved. Therapy does not guarantee a couple stays together; it can also help people decide whether repair is realistic.

How Do You Know if a Partner Is Cheating?

There is no reliable checklist that proves infidelity. Changes in phone privacy, schedule, affection or sexual behavior can have many explanations. Treat suspicious behavior as a reason for a conversation, not as evidence that confirms a theory.

Secretly monitoring a partner’s phone or accounts can create its own privacy and trust problems. Ask direct questions and decide what level of transparency you need in the relationship.

What to Do After Discovering Infidelity

Stabilize Before Making Big Decisions

You do not need to decide immediately whether the relationship is over. Take enough time to understand what happened and what you need to feel safe.

Consider STI Testing

If there may have been outside sexual contact, sexual-health testing can be practical even before you decide the future of the relationship. Testing needs depend on anatomy, exposures and timing.

Decide What Information You Actually Need

Some details are necessary for health, boundaries and decision-making. Graphic details may create more distress without helping you choose what happens next. A therapist can help couples structure disclosure when conversations become overwhelming.

Can Trust Be Rebuilt After Cheating?

Sometimes. Repair generally requires the person who broke the agreement to stop deceptive behavior, answer necessary questions honestly, tolerate the injured partner’s reactions and make consistent changes over time. The betrayed partner is not obligated to stay.

Trust is rebuilt by repeated behavior, not by one apology. If the relationship continues, both people may need to create a new agreement rather than pretending the old one was never broken.

What About Ethical Non-Monogamy?

If one or both partners genuinely want multiple relationships, consensual non-monogamy may be an option. It is not a retroactive excuse for cheating. Opening a relationship works only when people freely agree to the structure and can discuss boundaries, safer sex and emotional expectations.

If you are dating multiple people before exclusivity, our guide on when to stop dating multiple people explains how to handle that transition openly.

Reasons Explain Cheating, but They Do Not Decide Your Response

Research shows that infidelity has multiple motivations and different affairs can have very different meanings. That complexity can be useful if you are trying to understand what happened. It does not mean you have to forgive, stay or accept a boundary you did not agree to.

Your decision can be based on the behavior, the level of deception, whether responsibility is taken, whether the relationship still fits your values and whether rebuilding trust feels possible.

Infidelity Is Not Always a Sign of One “Broken” Partner

It is tempting to explain cheating by assigning one permanent character label to the person who cheated or one permanent flaw to the betrayed partner. Research is more complicated. Motives vary across people and situations, and the same person may report several motives for one affair.

That does not mean character and values are irrelevant. Repeated deception, entitlement and refusal to take responsibility are important behaviors. The point is that a useful explanation should be based on what the person actually did and why, not on a one-line stereotype.

Why Opportunity Matters Without Becoming an Excuse

Situational factors such as travel, alcohol, social settings or easy digital access can lower barriers for some people. Opportunity helps explain why a person who had not planned an affair might still cross a boundary. It does not erase the decision.

If someone blames alcohol, a coworker or a dating app as though they had no agency, that is different from acknowledging that the situation made a poor decision easier and changing the circumstances that contributed to it.

Digital Infidelity Can Be Just as Boundary-Specific

Modern relationships may need to define behaviors that older conversations about affairs rarely addressed: secret dating profiles, private sexual messages, paid sexual chats, hidden video interactions, emotional intimacy with an ex or maintaining a second online relationship.

There is no universal rule that every couple must use. The problem begins when one person knows a behavior violates the agreement and hides it anyway.

What Rebuilding Trust Usually Requires

Repair is more than increased phone access. Surveillance may temporarily reduce uncertainty, but long-term trust depends on consistent behavior, truthful answers, empathy for the injured partner and changes related to the circumstances of the affair.

The person who was betrayed may need time before affection or sex feels safe again. Pressuring them to “move on” can make repair harder. The person who cheated may also need to examine why they chose secrecy instead of communication, separation or renegotiation.

Rebuilding Does Not Require Returning to the Old Relationship

Some couples create a different relationship after an affair, with clearer agreements and different communication habits. Others decide that ending the relationship is healthier. Both outcomes can be reasonable.

If You Are the Person Who Cheated

Start by taking responsibility for the behavior without blaming your partner for making you do it. If there was sexual contact, be honest about health information that affects them and discuss STI testing. End ongoing deception if you want repair to be possible.

Then decide whether you actually want the relationship you are asking to preserve. Staying only because disclosure is uncomfortable or separation is inconvenient does not create meaningful commitment.

FAQs About Why People Cheat