Chevelle - I feel your pain as your sitch seems very close to mine except that my WAW evidently began to feel like leaving when our D went to college. We also get along great and there are OM in her life (crazy acting on her part - classic MLC).
However, I too continue to believe there is hope, but perhaps also realize that I need to move on.
Not sure if I can add anything here as I actually just started reading this site and the D process is beginning to get in motion, but when I saw your thread your sitch and feelings appear very similar to mine.
I have even read that between 6-14% of divorces actually end up getting remarried. I love my W as she is a very impressive person who in my opinion is going through great problems.
Sorry for the ramble here. Like you, I guess I need to continue to detach. It is so hard as I truly miss my best friend.
I hope the best for you.
Me: 48 Ex-W: 45 M: Nov '96, together since Oct 93 Bomb: on 10-yr anni - Nov '06 OM Separated: mid-Feb '07 Divorced mid-July '08 One daughter - 28 XW living w/OM