She has admitted EA but not PA. As Puppy likes to point out, WAS usually admit to one level lower than what is actually happening. Has she agreed to end contact with OM or is she still involved with him?
IMO and in my experience, MC is pointless while the WAS is involved in an EA/PA. They will only use it to justify why they're leaving.
If she has changed so much and doesn't show any interest in being the person you married, why do you want to be married to her? I'm not judging, I just want you be honest with your answer(s). If you simply don't believe in D and are willing to be married to the person she is right now for the rest of your life, then fine.
First things first, you have to deal with her affair. There are two main approaches. First is nicknamed "Bo Peep," i.e. being the best person you can be and hope she'll realize what she's losing and come back home. The other is more proactive, nicknamed The Gandhi Approach. You can check it out here.
If you love somebody, set them free. http://tinyurl.com/2empx2g
