It's been awhile but since it was discussed but there was indeed and 2nd individual that he fell into another EA with. It's just my gut speaking, but I have a definite feeling that his wife might have suspected...but of course I could be wrong about that.
Either way though she would definitely be feeling resentment, as you say, regarding his having the EA and him expecting HER to be the one changing. It's not as easy as just losing her resentment to move forward "if" the A's have never really been dealt with. Corrie, I don't remember if you've mentioned this or not...have you ever been cheated on? I mean, if you were...were you able to just drop the resentment to move on? I hope that didn't come across as condesceniding...that's not the intent. I'm really just asking an honest question to see what perspective you are coming at this from.