What Causes Infidelity in Relationships?

What Causes Infidelity in Relationships?

The question of “what causes infidelity in relationships?” has intrigued researchers for decades. Research, published in the British Journal of Psychology, claims that poor impulse control may be a significant factor with many unfaithful young partners.

It’s becoming clear that both personal history and personality disorders are important factors which contribute to poor impulse control and infidelity in relationships.


Impulse control problems are a compelling mental health issue in many couples therapy cases. It’s estimated that about 9% or more of the general population struggles with an ICD (impulse control disorder).

Some researchers suggest that this number is actually higher.

ICD’s are frequently underdiagnosed, partially because insurance companies refuse to cover treatment for them.

Couples therapists are seeing more cases involving behavioral addictions, such as the compulsive use of porn, as well as a rising rate of marital infidelity.

An ever-growing number of people today are being diagnosed with attention-deficit disorder, hyperactivity disorders, as well as various kinds of addictions.

Many different mental health issues such as Bi-Polar Disorder and Developmental Trauma have also been correlated with poor impulse control and compulsive sexual acting out, sometimes leading to infidelity.

Impulsive spouses tend to act on their immediate thoughts, feelings, and desires without considering the consequences.

We seem to be living in an age where self-discipline and self-regulation are the quaint artifacts of a simpler time. Some thought-leaders have speculated that technology is aggravating ICD’s by bestowed instant gratification upon us as a cultural norm.

What Causes Infidelity in Relationships? Research On the Role of Poor Impulse Control


The Queensland study conducted a survey of 123 heterosexual people who were age 17 to 25 All of the study subjects were currently in a relationship.

One obvious problem in generalizing the findings of this study was the discussion of poor impulse control in a population of study subjects whose brains may not have fully


In other words, impulse control is an all-too-common problem in the 17 to 25-year-old age bracket.

I agree that there is anecdotal evidence that impulse control may be an emerging problem in the more mature couple population that pursue couples therapy.

But clearly, better research on ICD, and how it impacts marriages over a long period is needed.

This study, because of it’s narrow focus on young adults, offers suggestive, but unconvincing evidence of the role that poor impulse control might play in infidelity in an older population.

The question of the role of poor impulse control is interesting, but this particular study isn’t going to be of much help, in my opinion.  Most young adults between the age of 17 to 25 do not yet have fully mature, adult brains.

Asking about poor impulse control among young adults is like asking why fish swim.

What Causes Infidelity in Relationships? Is It Impulse Control Disorders?

Research shows that people who cheat on their partner don’t tend to dwell on their impulse control issues.

Instead, low relationship satisfaction, especially for women, as well as a sense of disconnection, are typically offered as explanations for their unfaithful behavior.

As expected, the availability of an “attractive other” is also a significant catalyst for cheating or an emotional affair. The availability of a willing “attractive other” brings us back to the issue of poor impulse control.

The University of Queensland study also claimed that relationship duration and even the degree of commitment were not factors which impacted infidelity.

What Causes Infidelity in Relationships? The Upside of Experiencing An Unfaithful Spouse

what-causes-infidelity-in-relationships?It’s funny how the words we use change over time. Today we talk about “impulse control.”

In yesteryear, we called it “good character.”

A recent cross-cultural study explored the implications of infidelity for the women on the receiving end.

This research didn’t ask “what causes infidelity in relationships?” Instead, it asked, “what happens to the hurt partner, the involved partner, and the affair partner after the infidelity broke up the relationship?”

It was an impressive survey of nearly 6000 partners from almost 100 countries. This was a sizeable cross-cultural study, and the findings were fascinating.

Discovering that your partner has been unfaithful is a severe and painful trauma, but this research suggests that women who have been cheated on actually go on to have better and more successful intimate lives.

Post-Traumatic Growth of the Hurt Partner

This research shows that women who lose a relationship because of infidelity may experience post-traumatic growth.

It takes a little time, but these women develop more self-confidence and self-awareness. And they eventually bond with more reliable men with better self-control.

The ultimate loser is the mate poacher, now saddled with an unreliable partner with poor impulse control.

The “other woman” quickly learns that… if they do it with you…they will also do it to you.

Dr. Craig Morris, one of the principal authors of this research:

“The woman who ‘loses’ her mate to another woman will go through a period of post-relationship grief and betrayal, but come out of the experience with higher mating intelligence that allows her to better detect cues in future mates that may indicate low mate value. Hence, in the long-term, she ‘wins.’”

“Most women who have lost a mate to another woman report a ‘silver lining’ of higher mating intelligence. What this means, in their words, is that they are more attuned to cues of infidelity in a future mate, more aware of how other women interact with their mate, have more self-confidence and more self-awareness, and independence in general.”

Mate Poachers Get the Booby Prize

Essentially, many different women who were cheated on are less likely to be fooled again.

They have learned to spot potentially unfaithful men, and no longer feel vulnerable to getting involved with them.

The study reports that often as soon as six months to a year later, women who experienced infidelity developed a higher degree of emotional intelligence.

And what of the mate-poacher?

Researchers also found that in the majority of cases, the unfaithful partner’s new relationship soon blows up.

After the previous relationship breaks up, relationships with affair partners are incredibly unstable. 

If the affair ultimately results in marriage, and only a fraction ever does, research tells us that 75% of them end in divorce within 5 years.
Evidence from this study indicates that a woman who poached a partner from another woman will typically fail to enjoy a successful long-term relationship with her new partner.

About the Author Daniel Dashnaw

Daniel is a Marriage and Family Therapist. He currently sees couples at Couples Therapy Inc. in Boston, Massachusetts, three seasons in Cummington (at the foothills of the Berkshires...) and in Miami during joint retreats with his wife, Dr. Kathy McMahon. He uses EFT, Gottman Method, Solution-focused and the Developmental Model in his approaches.

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