Infidelity is most often acting out sexually. But, any activity that is hidden to one's partner is experienced as a betrayal of trust. Emotion Focused Couples Therapy is, in my experience, the best way to resolve these trust issues in a relationship.
Infidelity can be devastating for the spouse, the client and the family. But it doesn't have to define a person or blow up a relationship. As a matter of fact I have worked with hundreds of couples that actually have come out much better after healing from an infidelity. Because it brings to life problems that were never unearthed, or never discussed.
Counselor/Therapist, Master's Degree Psychology, Ordained All Faiths Minister
An emotional affair can be as debilitating as a physical affair in a committed relationship. Finding the origin of why the partner cheated and then follow up with healng techniques for the relationship as well as for the partner who strayed.