The thing is that you might have come to grips with the A but your W hasn't. The reasons why you cheated on her and how you treated her afterwards are fresh in her mind. Now I'm not saying that's the only reason and I'm not saying that's an excuse for her fooling around. What I'm saying is that you need to nail down the specific reasons you did those things in the first place and make amends.
No amount of begging, saying you've changed, etc. will work because quite frankly, she didn't see any of it until she threatened to divorce you.
What you need to do right now is: 1) Tell her you've changed your mind about the D. That you thought about it and that believe that you two can work things out. 2) Apologize for all the hurt you've caused and say you want to move forward to healing and helping. 3) Stop all relationship talk after that. 4) SHOW her the changes but EXPECT NOTHING. 5) You're doing what all newcomers do and are expecting her to change her attitude because YOU've suddenly changed. This is on her timetable not yours.
So again, state what you want not what she wants. Show her you understand her hurt. And continue the positives.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.