It may seem obvious, but women can be very forgiving, more so than you might suspect. Practically speaking, divorce is not a good option for most women, also. Most married women don't want an open marriage, but on the other hand, most married women are not so naive as to believe their man may never stray, or at least, think about straying. Men are about actions and women are about words (as I learned later) In all the anger, the one thing my ex did not do was TELL me he wanted to save the marriage, that he wanted me, that he loved me. Seems obvious, but for me, that would have worked miracles. And you may have to listen to her talk and say a lot of hard things, and just say: I hear you. For me, these words would have made me stay, at least long enough to give it another shot (although it was a good thing in our case that the marriage ended, after all), so you may try it. In your case, since she knows what has transpired, it would not hurt to come clean. You could say b/c of the lack of intimacy in your marriage, you sought a provider, but the person you always loved was her, and that you now really want to make it work. I would still expect her to get mad immediately but the words take time to sink in and make her think. If you want her, you could try this, or offer to go to marriage counseling (to address not just your actions but the problems in the marriage that prompted it), and you know, flowers and cards and stuff would not hurt, even if she throws them back at you, it will start to build in her heart that you are trying. But only do this if you really want her and you want to rebuild trust and intimacy in the marriage. If you both are terribly unhappy, well...time is a great healer. Just a feminine perspective. I'm no Dr Phil! But good luck.