Also recommend the book, After the Affair by Janis Abrahms Springs, PhD.
Attachment based Emotionaly Focused Couples therapy is particularly effective in helping couples move past infidelity as cheating is often not the cause of the problem, but more a symptom of disconnection. You can find a therapist
here: http://www.iceeft.com/. Difficult, but certainly possible to overcome. Wish you the best.