What is infidelity? Understanding betrayal and trust

Infidelity is often associated with a physical affair, but in reality, it can be much more complex than that.

For some people, infidelity involves sexual or physical contact outside the relationship. For others, it may include emotional intimacy, secret online relationships, hidden financial decisions, or behaviours that cross agreed relationship boundaries.

What constitutes infidelity can vary from one relationship to another. However, a common theme is often the presence of secrecy, deception, and a breach of trust.

Why does infidelity hurt so much?

Many people assume that the pain of infidelity is simply about sexual or romantic betrayal. In practice, the impact often goes much deeper.

When trust is broken by someone we love and depend on, it can challenge our sense of safety, security, and understanding of the relationship. Research suggests that infidelity can trigger intense emotional reactions, including anger, betrayal, insecurity, shame, jealousy, sadness, anxiety and depression. Some individuals also report symptoms similar to those experienced following other traumatic events, including intrusive thoughts, rumination and hypervigilance (Rokach & Chan, 2023; Gordon, Baucom & Snyder, 2005).

For many people, the question is not simply "Did they cheat?" but rather "How could the person I trusted do this?"

Different forms of infidelity

Although physical affairs are often the first thing that comes to mind, infidelity can take many forms.

Physical infidelity

Sexual or physical involvement with someone outside the relationship.

Emotional infidelity

Developing a deep emotional connection, intimacy or dependency with someone else while concealing it from a partner.

Online or cyber infidelity

Secret messaging, flirting, sharing intimate content, or maintaining hidden online relationships.

Financial infidelity

Hiding spending, debt, gambling, accounts, or significant financial decisions from a partner.

Micro-cheating

Behaviours that may appear small in isolation but involve secrecy, flirtation, or blurred boundaries that undermine trust.

The impact of these behaviours often depends on the expectations and agreements within the relationship.

Why does infidelity happen?

One of the most common questions asked after discovering infidelity is: "Why did this happen?" Unfortunately, there is rarely one simple answer.

Research suggests that infidelity can be associated with a range of factors, including relationship dissatisfaction, low commitment, poor communication, opportunity, desire for novelty, unmet emotional needs, and individual vulnerabilities (Fincham & May, 2017).

Understanding the reasons behind infidelity does not excuse the behaviour. However, it can help individuals and couples make sense of what has happened and decide how they wish to move forward.

Can relationships recover?

While infidelity can be devastating, it does not automatically mean the end of a relationship. Some couples decide to separate. Others choose to rebuild.

Research and clinical experience suggest that recovery is more likely when there is genuine accountability, openness, empathy, and a willingness to address the impact of the betrayal (Gordon, Baucom & Snyder, 2005).

Rebuilding trust is rarely a quick process. It often involves difficult conversations, emotional healing, greater transparency, and a commitment to creating new patterns within the relationship.

Infidelity is rarely as simple as many people imagine. It is not only about the behaviour itself but also about trust, honesty, emotional safety, and the meaning attached to the betrayal.

Whether you are questioning a partner's behaviour, recovering from an affair, or trying to decide what happens next, it can be helpful to seek support rather than navigating the impact alone.

Looking for support?

If you are struggling with the impact of infidelity, relationship difficulties, trust issues, anxiety, or communication challenges, professional support can help you better understand your experience and decide how you would like to move forward.

A couples counsellor can support individuals and couples experiencing the emotional impact of betrayal, relationship difficulties, anxiety and life transitions.

Further resources

If you would like to learn more about infidelity and the different ways trust can be affected within relationships, you may find it helpful to listen to Episodes 1 and 2 of the Inside Aromacee Podcast, Are They Cheating? and 7 Types of Infidelity – It's Not Just Physical Cheating. 

The podcast explores different forms of infidelity, including physical, emotional, online, financial and micro-cheating, and discusses how these experiences can affect trust, communication and relationships.

References

Fincham, F. D., & May, R. W. (2017). Infidelity in romantic relationships. Current Opinion in Psychology, 13, 70–74.
https://doi.org/10.1016/j.copsyc.2016.03.008

Gordon, K. C., Baucom, D. H., & Snyder, D. K. (2005). Treating couples recovering from infidelity: An integrative approach. Journal of Clinical Psychology, 61(11), 1393–1405.
https://pubmed.ncbi.nlm.nih.gov/16161129/

Rokach, A., & Chan, S. H. W. (2023). Love and Infidelity: Causes and Consequences. International Journal of Environmental Research and Public Health, 20(5), 3904.
https://pmc.ncbi.nlm.nih.gov/articles/PMC10002055/