First, I have no "good news" story to share w you, but my sitch is somewhat similar---WAS has been involved in EA for over a year & has disregarded all his values and has left his family (3 boys).
My advice is to work on yourself--save yourself. Take the time to make changes (180s) and show her YOU are the better choice.
Also, decide what YOU want. If she started moving back in your direction, would you want to try to save your M? Can you find forgiveness in your heart? Trust, of course, would take time to rebuild.
(BTW forgiveness is something you need to do for YOURSELF regardless of whether or not your W sees the light).
I'm 6 months in & at a place similar to yours where I'm having a hard time seeing our M being saved. Now, my goal is really about ME and MY BOYS. If H is in the equation great, if not...well, I need to learn to be great w that too.
((()))
M- 18 T-21 S-14,11 & 10 BD 6-18-2012 (OW-EA) H moved out 11-3-2012 10-5-13 Me- I want a divorce. I want to move on w my life. 11-25-13 Jointly filed.