Research identifies eight core reasons people have affairs: anger, low self-esteem, lack of love, low commitment, need for variety, neglect, sexual desire, and circumstance; these often overlap, stemming from personal issues like boosting self-worth (esteem), relational problems like feeling unloved (lack of love/neglect), or opportunistic situations (circumstance). Infidelity isn't always about a broken relationship but can be driven by internal needs for novelty, validation, or a desire for escape, sometimes even serving as a subconscious exit strategy from the relationship.
There are eight key motivations that lead people to be unfaithful, and most don't involve sex. Many people cheat because of anger, lack of love, low commitment, esteem, and neglect. Plus, some cheaters want to be discovered.
In general, men are more likely than women to cheat: 20% of men and 13% of women reported that they've had sex with someone other than their spouse while married, according to data from the recent General Social Survey(GSS).
There are several types of personalities that have been found to be more prone to cheating, including narcissists, psychopaths, and those with an avoidant attachment style.
Previous litera- ture has identified characteristics of the partner involved in infidelity; this study investigates the Big Five personal- ity traits (openness, conscientiousness, extraversion, agreeableness, and neuroticism) of uninvolved partners.
There isn't one single "best" predictor of cheating; rather, it's a combination of factors, with relationship dissatisfaction, low sexual satisfaction, mismatched sexual desire, and poor communication being the strongest predictors, often alongside individual traits like insecure attachment styles, impulsivity, and a history of infidelity. Ultimately, a lack of emotional connection and unresolved relationship issues significantly increase the risk, according to this Psychology Today article, this National Institutes of Health article, and this Medium article.
The 80/20 rule in relationships explains cheating as the temptation to abandon a solid partner (80% good) for someone new who seems to offer the missing 20% of needs, a pursuit often leading to regret as the new person lacks the original 80%. Infidelity often arises from focusing on flaws (the 20%) rather than appreciating the substantial good (the 80%), making an affair partner seem appealing for fulfilling that small gap, but ultimately resulting in losing the valuable foundation of the primary relationship.
53.4% of affairs happen with someone the individual knows very well. This could be a friend, a coworker, or even a neighbor3. Specifically, 44% of cheating men had an affair with someone from work, making the workplace a common ground for infidelity3.
One thing that cheaters often do is say one thing and do another. For example, it is so easy for someone to tell you they love you, but when you never see them perform any actions that indicate that they love you like: doing something thoughtful like buying you flowers, well, then this could be a red flag.
Soft cheating (or micro-cheating) involves subtle, often digital, behaviors that cross relationship boundaries and breach trust without being full-blown infidelity, like excessive social media interaction with others, hiding messages, or maintaining secretive contact with an ex, often stemming from a need for validation but eroding intimacy and causing insecurity.
Men still cheat more than women overall, but the gender gap is narrowing among younger generations. Infidelity rates peak at different age ranges for men (60-69) and women (50-59), showing age-specific patterns. Both psychological factors and relationship dynamics influence cheating behavior across all demographics.
The psychology behind why people cheat in relaionships.
Hunger for Emotional Intimacy: Many people cheat not for physical reasons but because they feel emotionally unfulfilled in their relationships. They seek external validation, attention, or intimacy that is lacking in their relationship.
Surprisingly, these full-blown affairs almost never start at a bar or club. Instead, they usually begin in much more wholesome environments: The workplace. The workplace is where most affairs begin.
Many men who cheat still claim to care deeply for their partners, which can create confusion and emotional pain. New research shows that male infidelity is often not about love or attraction but rather may result from unmet emotional needs, or physical intimacy needs, or self-esteem issues.
Affairs often start subtly, beginning with emotional disconnection, unmet needs (like feeling unseen or unappreciated), and blurred boundaries, frequently blossoming from friendships, especially at work, through shared frustrations, lunches, or social media, evolving from mental/emotional intimacy to secrecy and physical betrayal as individuals seek validation, novelty, or a lost sense of self, rather than a happy person usually seeking an affair.
On average, affairs usually end within 6 months to 2 years.
Before someone cheats in a relationship, he or she becomes mentally detached from the relationship. This may happen consciously or subconsciously. The person may not be getting something out of the current relationship, so he or she seeks that missing element in someone else.
Interestingly enough, some individuals who cheat also exhibit signs of dissatisfaction long before they actually stray. They may withdraw emotionally from their partners or display irritability over minor issues—a signal that something deeper is amiss within themselves rather than solely within the relationship.
How to Know if She Slept with Someone Else
In most cases, affairs end peacefully and in secret. By their very nature, there is not much of a commitment to hold them together, and a desire to do the "right thing" is usually the excuse an unfaithful spouse uses to end it. But the real reason is usually that the affair has become more trouble than it's worth.
The 777 rule for marriage is a relationship guideline to keep couples connected by scheduling specific, regular quality time: a date night every 7 days, a night away (getaway) every 7 weeks, and a romantic holiday every 7 months, often without kids, to foster intimacy, reduce stress, and prevent routine from overtaking the relationship. It's about consistent, intentional efforts to prioritize the partnership.
Cheating on a partner doesn't always mean love is gone.
Many who cheat still feel love for their partner and guilt for the infidelity. Cheating can stem from emotional distance, insecurity, or the fear of missing out. Addiction, stress, or past trauma can drive infidelity without negating love.
There isn't one single "best" predictor of cheating; rather, it's a combination of factors, with relationship dissatisfaction, low sexual satisfaction, mismatched sexual desire, and poor communication being the strongest predictors, often alongside individual traits like insecure attachment styles, impulsivity, and a history of infidelity. Ultimately, a lack of emotional connection and unresolved relationship issues significantly increase the risk, according to this Psychology Today article, this National Institutes of Health article, and this Medium article.
But it does provide some rough guidelines as to how soon may be too soon to make long-term commitments and how long may be too long to stick with a relationship. Each of the three numbers—three, six, and nine—stands for the month that a different common stage of a relationship tends to end.
1. Lack of Honesty. Often when we think of honesty, notably honesty in marital relationships, we think of a very tangible “where were you last night” kind of honesty. While this is obviously critically important, there are many other kinds of dishonesty that can destroy marriages.