Cheating is one of the most painful experiences a relationship can endure. It shatters trust, shakes foundations, and leaves behind a trail of emotional debris. For many, the act of infidelity feels unthinkable — a betrayal that can’t be explained, only condemned.

And yet, research shows that infidelity is common, affecting anywhere from 20% to 70% of couples depending on how broadly “cheating” is defined (Glass & Wright, 1992; Atkins et al., 2001). It’s more than a lapse in judgment or a moment of lust — often, it’s a signal that something deeper is at play.

So why do people cheat?

In this post, we’ll explore the main psychological and relational reasons people betray their partners, based on the latest research. Understanding these motives doesn’t excuse the behaviour — but it can provide insight, empathy, and guidance for those navigating the aftermath.

1. Emotional Dissatisfaction: When Needs Go Unmet

One of the most commonly cited reasons for cheating is emotional neglect. People often seek outside connection when they feel unheard, unappreciated, or emotionally disconnected from their partner.

In a study by Glass and Wright (1992), over 70% of participants who had affairs said they were primarily motivated by a desire for emotional intimacy, not just sexual gratification.

Common emotional triggers include:

• Feeling taken for granted

• Lack of affection or validation

• Emotional isolation or avoidance

• Unresolved conflict or coldness

When people feel invisible in their relationship, they may seek connection elsewhere — not necessarily out of malice, but desperation.

As psychologist Esther Perel puts it in The State of Affairs, “People stray not because they are looking for another person, but because they are looking for another version of themselves.”

2. Sexual Dissatisfaction and Unfulfilled Desire

While not the only factor, sexual dissatisfaction is still a leading motivator behind infidelity — especially in long-term relationships where routine and resentment can replace passion and play.

This may include:

• Mismatched libidos

• Sexual boredom or lack of novelty

• Unaddressed fantasies or fetishes

• Feeling sexually rejected or undesired

In a large-scale study by Selterman et al. (2019), 32% of people who cheated said it was due to unmet sexual needs. Interestingly, this number was similar for both men and women.

Sexual infidelity isn’t always about sex itself. It’s often about feeling desired, alive, or validated. Affairs can act as an escape from sexual stagnation — or a rebellion against emotional or physical neglect.

3. Low Commitment and Poor Relationship Investment

Some people cheat because they were never truly committed in the first place.

According to Investment Model Theory (Rusbult, 1980), commitment in a relationship is based on three key factors:

• Satisfaction

• Investment (time, energy, resources)

• Perceived alternatives

When any of these are low — or when attractive alternatives seem easily accessible — people are more likely to stray.

Modern dating culture, with its emphasis on swiping, endless options, and fear of “settling,” can make true commitment feel like a risk rather than a reward.

Some signs of low commitment:

• Refusing to define the relationship

• Avoiding shared goals or plans

• Expressing ambivalence about long-term potential

These individuals may cheat not because they’re deeply unhappy, but because they were never fully in to begin with.

4. Opportunity and Lack of Impulse Control

Sometimes, cheating isn’t meticulously planned — it’s opportunistic.

• A flirty coworker on a business trip

• A drunken night out

• A former flame sliding into DMs

In these cases, the opportunity combines with low impulse control, often fueled by alcohol, ego, or a sense of invincibility. Research from Drigotas et al. (1999) found that people with lower self-regulation and high opportunity were more likely to engage in infidelity, even if they were otherwise satisfied with their relationship.

This kind of cheating is often about novelty, thrill, or validation, and not necessarily reflective of deep relational dissatisfaction.

Unfortunately, even “one-time mistakes” can cause lasting harm — especially when paired with secrecy or blame-shifting.

5. Revenge or Retaliation

Sometimes cheating isn’t about desire — it’s about punishment.

In what researchers call “revenge infidelity,” people may cheat in response to:

• Being cheated on themselves

• Feeling betrayed emotionally (e.g., by lies, neglect, abandonment)

• Longstanding unresolved conflict

This tit-for-tat behaviour is rooted in resentment and an attempt to rebalance perceived injustice in the relationship.

While it might bring short-term satisfaction, revenge cheating rarely offers genuine relief — and often deepens the emotional damage on both sides.

As one participant in a Journal of Sex Research study noted, “I wanted them to feel what I felt. But in the end, I just felt worse.”

6. Self-Esteem Issues and the Need for Validation

Some people cheat not because their partner is lacking — but because they are struggling with their own self-worth.

Infidelity in these cases becomes a way to:

• Feel desirable or attractive

• Regain a sense of power

• Escape internal feelings of inadequacy or boredom

This is especially common among individuals with narcissistic traits or those experiencing a personal identity crisis. Affairs provide an ego boost, a sense of control, or even a temporary distraction from aging, depression, or midlife dissatisfaction.

In a study from Psychology Today, Dr. Robert Weiss describes this as “self-focused infidelity,” where cheating becomes a tool for managing one’s internal emotional landscape — rather than a commentary on the partner or the relationship.

The Role of Attachment Styles

Attachment theory also plays a key role in infidelity patterns. According to research by Allen and Baucom (2004):

• Avoidantly attached individuals may cheat to maintain emotional distance or preserve autonomy

• Anxiously attached individuals may cheat to avoid abandonment or seek validation

• Securely attached individuals are least likely to cheat, as they’re better equipped to communicate and repair

Understanding your own attachment style — and that of your partner — can offer critical insight into relational behavior and vulnerability to infidelity.

So, Why Do People Really Cheat?

To summarize, people cheat for a complex mix of reasons — often involving unmet emotional or sexual needs, personal insecurities, relationship dissatisfaction, poor boundaries, or unresolved trauma.

It’s rarely just about sex. It’s about:

• Emotional disconnection

• Unacknowledged needs

• Escape from discomfort

• A breakdown in communication

• Or an internal crisis that spills into external betrayal

Cheating is ultimately a symptom — not just of a flawed relationship, but often of internal misalignment.

Can Relationships Survive Infidelity?

Yes — but it depends on several factors:

• The willingness of both partners to be honest, vulnerable, and accountable

• The presence of genuine remorse

• A shared desire to rebuild, not just move on

• Professional support (like couples therapy) to unpack the root causes

Rebuilding trust is a long process. It involves transparency, empathy, and a commitment to change, not just apologies.

As Esther Perel says, “Affairs can break a relationship — but they can also wake it up.”

Final Thoughts: Infidelity as a Mirror, Not a Verdict

Cheating is never justified — but understanding the motivations behind it can offer healing, growth, and clarity.

Whether you’ve been cheated on, have cheated yourself, or are simply trying to avoid it in your future relationships, remember this:

Affairs don’t just reflect what’s wrong with the partner or the relationship — they reflect what’s unresolved within us.

If you want to protect your relationship from infidelity, don’t just monitor behavior — explore the emotional undercurrents:

• Are we both feeling seen and appreciated?

• Are we prioritizing connection and intimacy?

• Are we communicating our needs with honesty and empathy?

Because in the end, the strongest relationships aren’t the ones with the most rules — but the ones with the most awareness.