I would like to encourage you to post in Newcomers for a while, so you will get more replies. Something led you here to the board, didn't it?
I was the betrayer in my M. I tried to do what your H said about not contacting OW, yet won't send the letter. Without that final letter that states it is over forever, then he is leaving the back door open.......
If you don't feel you can push it right now, that's your decision, but I am concerned the MC's implications and your acceptance is causing him to feel he can play both sides of the fence. There's still something there he is not turning loose.
How about giving us more background, and stick around?
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!