This is so awesome and you're doing great. I hope your W realizes what kind of man she has, someone that won't give up on her and is willing to fight for the love between them.
The only thing I'd suggest is making sure she knows that while it's not going to be easy because of the route SHE chose with infidelity, you do love her. That will keep her going when times get rough.
ME: 38 BF: 40 T: 10y, no kids, no M (by choice) BD: 7/14/14, BF admits to PA, wants out, lies about new R. 10/1/14: I move out, BF lies about move in with OW 12/4/14: OW confronted, reveals all the lies