Tread, do not buy into her lie of how they are "just friends now". They don't go from lovers (emotionally or physically) in an affair to "just friends". The "just friends" is a smoke screen they think gives them clearance to continue contacting each other. If the spouse asks questions, they tell them it's okay b/c they are only friends. I don't why H's think they are suppose to simply roll over and accept his W's inappropriate behavior just b/c she uses the disguise of friendship. Betrayal is wrong, regardless of the name she wants to use to condone it.
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!