Well, we all know how hard it is to put talk into action. I've found a lot of help from my Christian counselor in Austin. Really recommend his stuff: http://www.affairrecovery.com
He talks about when a wife cuts off an affair, she really has to go through a grieving process over the relationship. It has felt very good to her. So your W has some very tough choices to make in order to do the right thing. It's not as simple as "the Bible says", but you know that.
Hang in there, give her time. Maybe lots of time.
Me: 30 W: 28 T 8, M 6 S: 7-27-2007 W filed (again) 3-2011 Served 8-2011 Responded, now dark "I have decided to stick with love. Hate is too great a burden to bear" MLK