I hate that you're left hanging with no responses. I'm not sure what to suggest but if you go to the Healing Library and check under books, there's a list of titles that maybe you can research and find one that may help your situation.
"That's the thing about pain, it demands to be felt."
The Publisher's Weekly review of this book does say that it has at least one example of infidelity in it:
Horn's example situations include spouses who hit or cheat, spouses' bosses who grope, coaches who berate, false friends who cajole confidences, business partners who steal, neighbors who instill fear and people who chronically hit up family members for bail money (or "deja moo"). Role playing "Action Plans" for conversation help firm up psychic independence and avoid pointless, draining argument.
I've not read it myself. Hoping others come along with more experience. If not, there are many members here to help you with advice in the different forums here on this site.
Best of luck to you!
[This message edited by LosferWords at 6:02 PM, March 13th (Thursday)]
It is similar to the 180 & to some extent, addresses codependency.
Good luck (((mswc101)))