Man, I think you should be thankful for what you have. Let the past be just that...the past. Forgive and start again...not start over, start again - there is a difference.
Tell her you forgive her and will love her almost unconditionally...the only condition being that she commits 100% to working on the marriage with you.
I'd shake hands with the devil to have your sitch.
Me: 54 Her: 50 and sexy as hell M: 32yrs T: 34yrs Bomb: Sept 26-07 "lost our emotional connection" Bomb 2: Dec 25-07 she's "not feeling desire" She asked if she could come home Apr 26-08! Everything's GREAT!