Have you read Michele's article "Healing from Infidelity?" If you haven't you should. And if your W seems to want to work thru this, maybe she could read it too so that she understands that it will take time to resolve, and you will be curious with the hows and why's. The why's usually arent that easy to come by, but I think the hows are. Maybe then you could work on it together.
I could be way off base here, but she seems to want to fix it from what I have heard.
FLoyd The grass is always GREENER over the septic tank.