Psychology of Relationships

Psychology of Relationships

The Erosion of Intimacy: Dealing with the Dark Side of Relationships

Cheating and the collapse of connection.

Dr. Gary W. Lewandowski Jr.'s avatar
Dr. Gary W. Lewandowski Jr.
Jul 24, 2025
∙ Paid

Infidelity may be the ultimate relationship betrayal.

This is a paid post because it moves from insight into practice.

Inside, I go deeper with concrete examples, scripts, tools, and step-by-step strategies you can use to navigate dating and relationships more effectively.

As a client once described, “It didn’t happen overnight. One day we were laughing in bed, and the next we’re sitting in silence at dinner, wondering how we got here and when the emptiness crept in.”

Love is supposed to be perfect, simple, and always amazing. Except it isn’t.

Intimacy doesn’t end with an explosion, but more often, with erosion.

Most couples feel it at some point: emotional disconnection and distance. Most also dismiss those feelings as inconsequential or ignore them, hoping they’ll pass. Unfortunately, as intimacy withers away there are consequences for relationship well-being (Finchem, 2017). When a relationship is no longer satisfying, it provokes one of the darkest relationship behaviors of all: cheating.

Admittedly there are lot of “dark” behaviors to discuss, but infidelity is the ultimate relationship violation, and one of the most notorious relationship killers.

Because of that, we’re going to focus on

  1. Why people cheat

  2. Who is most likely to get cheated on

  3. How to catch a cheater

8 Reasons Why People Cheat

All affairs aren’t created equal. Motivations matter.

Some are brief trysts of convenience and circumstance, others are longer calculated affairs (some are inappropriate field trips to a Coldplay concert with a work “friend”). It all hurts. So, why are partners unfaithful in the first place?

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