As a former AWAW, I can tell you that fear of losing her will show on you and it will be a turn-off to her. I believe that regardless of what WAW say to their LBH, they truly want to see him show strength and leadership. I think it is something that's just built inside of the very basic part of a female to look for a mate that is strong enough to take care of her and her off-springs. Whenever a male allows the female to bully him in any way, then she stops respecting him. When you allow this sort of behavior, that tells her that you are not as strong as she is....and therefore she doesn't respond to you in a positive way. She is disrespecting you with this A and you need to call it what it is......an affair and stop allowing her to talk all around it about other things in the R. You two can talk to the cows come home but it will not help one bit as long as OM is still in the picture and you need to just stop talking about the R, period, and put the monkey on her back. Nothing will work until she gets rid of OM. Say the words to her and don't say, "until you show effort", tell her until she dumps the OM and can be a faithful wife, then you don't have any desire to be with her.
I tell you men that if you would stop being afraid and act as if you don't want her......you would see a big change, but you won't as long as you act like a whimp who is scared of her leaving you. She can't love a man who would put up with a W having an A!!
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!