Repeated cheating is rarely about a single bad decision. If you find yourself in this pattern across relationships, there are identifiable psychological, neurological, and developmental factors that drive the behavior. Understanding them is the first step toward changing it.
Research published in *Archives of Sexual Behavior* tracked people across multiple relationships and found that those who cheated in one relationship were 3.4 times more likely to cheat in the next one. Of people who cheated in their first relationship, 45% cheated again in a subsequent relationship, compared to only 18% of those with no prior history. That gap suggests something deeper than circumstance is at work.
Your Brain’s Reward System Plays a Role
The early stages of a new romantic connection flood your brain with dopamine, the chemical that drives feelings of excitement, desire, and motivation. This is the “falling in love” high, and it’s powerful. Over time in a long-term relationship, your dopamine receptors become less responsive to the same partner through repeated stimulation. Your brain starts craving novelty to restore that intensity.
For some people, this creates a cycle: the thrill of someone new delivers a dopamine hit that a stable relationship simply can’t match, and the pull toward that feeling becomes difficult to resist. Genetics may even play a part. Variations in a specific dopamine receptor gene (DRD4) have been linked to infidelity, possibly because people with this variation have a stronger neurological response to new and exciting experiences. Some individuals also have lower levels of an enzyme that regulates dopamine, which may further increase vulnerability to affairs.
This doesn’t mean your biology excuses the behavior. But it helps explain why cheating can feel compulsive rather than deliberate, and why willpower alone often isn’t enough to stop it. The chemicals that promote long-term bonding, like oxytocin and vasopressin, operate on a completely different system than the dopamine-driven novelty response. People who repeatedly cheat may have a stronger pull toward the novelty circuit and a weaker engagement with the bonding one.
Insecure Attachment and Emotional Disconnection
How you learned to relate to people as a child shapes how you behave in adult relationships. Research on over 300 people in committed relationships found that insecure attachment styles were positively associated with a higher propensity toward infidelity. Insecure attachment also correlated with lower authenticity (the ability to be your genuine self) and lower emotional intimacy, both of which independently predicted a greater likelihood of cheating.
In practical terms, this means people who struggle to feel emotionally safe with a partner, who pull away when things get close, or who constantly fear abandonment, are more likely to seek connection outside their relationship. The affair isn’t really about the other person. It’s a workaround for an intimacy problem. If getting truly close to someone feels threatening, having a secret relationship lets you experience connection while maintaining an escape route. If you fear your partner will leave, cheating can feel like a preemptive strike: you hurt them before they can hurt you.
Childhood Experiences Set the Stage
A study examining how childhood trauma affects adult relationship behavior found a significant positive correlation between trauma scores and infidelity. People who experienced emotional abuse, physical abuse, sexual abuse, emotional neglect, or physical neglect as children were more likely to cheat as adults. These same individuals were also more likely to develop insecure attachment styles, creating a chain reaction: childhood pain leads to difficulty with closeness, which leads to seeking connection in unhealthy ways.
Growing up in a household where infidelity was present adds another layer. Children who witness a parent’s affairs absorb a model of how relationships work. Even if they consciously reject that model, the pattern can feel familiar and default in ways that are hard to recognize without deliberate self-examination.
The Validation Loop
One of the most common drivers of repeat cheating isn’t lust or boredom. It’s a desperate need to feel wanted. People with fragile self-esteem often use the attention and desire of a new person as a way to temporarily fill a void. The affair provides a rush of feeling attractive, interesting, and valued that masks deep-seated insecurity.
The problem is that this fix never lasts. The validation from a new partner wears off just like dopamine does, and the underlying insecurity remains untouched. So the cycle repeats: feel empty, seek someone new, feel temporarily whole, watch it fade, feel empty again. This pattern can look like serial cheating across multiple relationships or overlapping affairs within the same one. Either way, the core issue isn’t about your partner or the person you’re cheating with. It’s about what you believe about yourself when nobody is paying attention to you.
Emotional vs. Physical Motivations
Not all cheating comes from the same place, and understanding your specific motivation matters. Research on gender differences in cheating has historically suggested that men are more likely to cheat for physical reasons (sexual desire, wanting variety, situational opportunity) while women are more likely to cheat because of emotional neglect in their primary relationship.
However, more recent multinational research complicates this picture. A study of 254 people across 19 countries who were actively cheating or had recently cheated found that both men and women showed a pattern of “strategic dualism,” feeling stronger physical attraction to an affair partner while feeling stronger partnership and stability with their primary partner. The researchers concluded that framing infidelity as primarily a male or female issue oversimplifies what’s actually happening. Regardless of gender, repeat cheating often involves seeking something specific that feels missing, whether that’s physical excitement, emotional depth, or both.
Situational Cheating vs. a Pattern
There’s an important distinction between cheating that happens because of a specific situation (being intoxicated, going through a crisis, being in an overwhelming circumstance) and cheating that follows you from relationship to relationship. Situational cheating tends to be shorter-lived and less likely to repeat. Pattern-based cheating points to something structural: an attachment wound, a self-esteem deficit, a neurological predisposition toward novelty, or unresolved trauma.
If you’re asking “why do I keep cheating,” you’re likely in the second category. That’s not a character flaw you’re stuck with. It means the behavior is serving a function for you, meeting a need that isn’t being addressed any other way. Identifying that need is what makes change possible.
Breaking the Pattern
Stopping a repeat cheating pattern requires working at the level where the problem actually lives. For most people, that means therapy, specifically approaches that address attachment, trauma processing, or both. The goal isn’t to build more willpower. It’s to understand and eventually rewire the internal dynamics that make cheating feel necessary or inevitable.
A few things that make a difference in practice:
- Identifying your trigger. Is it when your partner gets emotionally close? When you feel ignored? When you’re stressed? The moment right before you start pursuing someone new contains critical information about what you’re actually seeking.
- Building tolerance for emotional intimacy. If closeness feels threatening, learning to stay present with discomfort in a safe relationship (including a therapeutic one) gradually rewires the avoidance response.
- Developing internal validation. If the affair is really about feeling wanted, the work involves learning to generate that sense of worth without requiring another person to provide it.
- Addressing unresolved trauma. Childhood experiences that created insecure attachment don’t resolve on their own. They need to be processed directly, often with a therapist trained in trauma-informed care.
The 45% recidivism rate from the longitudinal research is sobering, but it also means that more than half of people who cheated once did not cheat in their next relationship. The pattern is strong, but it isn’t destiny.