How Common Is Infidelity?

By Traci Koen

Few relationship experiences are as painful and destabilizing as discovering infidelity. When trust is broken, it can leave partners feeling shocked, hurt, and unsure about the future of their relationship. It can even leave people wondering how common infidelity actually is.

While no statistic can fully capture the complexity of relationships, research suggests that infidelity occurs more often than many people realize. Understanding how common it is and why it happens can help couples approach the issue with more clarity and compassion.

What the Research Says

Studies on relationships consistently show that infidelity is not rare. Research estimates that around 20 percent of married individuals report having had a sexual affair at some point in their marriage. When emotional affairs, online relationships, and other forms of betrayal are included, the numbers may be even higher.

Infidelity can occur in relationships of all types and across all age groups. It’s not limited to people who are unhappy in their partnerships, and it doesn’t happen only in struggling relationships.

Some couples appear stable from the outside, yet still experience betrayal behind closed doors. That reality can make infidelity feel especially confusing and painful for the partner who was betrayed.

Why Infidelity Happens

There is rarely a single cause behind infidelity. It often develops from a combination of personal vulnerabilities, relationship challenges, and opportunity.

Some people seek affairs because they feel emotionally disconnected from their partner. Others may be searching for validation, excitement, or a sense of novelty that feels missing in their daily lives. Stress, major life transitions, and unresolved relationship conflicts can also create conditions that weaken boundaries.

For some individuals, infidelity is less about the relationship itself and more about personal struggles such as low self-esteem, difficulty communicating needs, or challenges with impulse control. Understanding these underlying factors does not excuse the betrayal, but it can help explain why it happens.

The Different Forms of Infidelity

When people think about infidelity, they often imagine a physical affair. However, betrayal can take many forms. Emotional affairs are one common example in which a person may develop a deep emotional connection with someone outside the relationship, sharing personal thoughts and feelings that would normally belong within the partnership.

Technology has also introduced new gray areas. Private messaging, secret social media interactions, and online flirting can sometimes cross boundaries, even if there is no physical contact.

For many couples, the secrecy itself becomes a form of betrayal. Because every relationship has different expectations around boundaries, what counts as infidelity can vary from couple to couple.

Can Relationships Recover?

Although infidelity can feel like the end of a relationship, many couples do choose to work through it. Recovery is not quick or easy, but healing is possible when both partners are willing to engage in honest reflection and repair.

Rebuilding trust often involves open communication, accountability from the unfaithful partner, and space for the hurt partner to process their emotions. Couples must also address the deeper patterns in the relationship that may have contributed to the disconnection. For some couples, this process ultimately leads to stronger communication, clearer boundaries, and a more intentional relationship moving forward.

Moving Forward After Betrayal

Infidelity can bring intense emotions, such as grief, anger, confusion, and fear, about what comes next. Whether a couple chooses to repair the relationship or separate, having support during this time can be incredibly helpful. Therapy provides a safe space to process the emotional impact of betrayal, rebuild communication, and explore what healing might look like for both partners.

If infidelity has affected your relationship, working with a couples therapist can help you navigate the pain, understand what happened, and move forward with clarity and support. Contact us to learn more and get started.