Your sitch sounds very similar to mine and I wish I could offer some sound advice. In my case I am trying to detach and not pursue. However, like you, I feel her moving further away. After she moved out, we would get together for weekends (she would come over and help get the house ready for sale and end up spending the weekend - it was great until Sunday night when she would leave).
Anyway, I have since detached and plan to file in the next month. I was hopeful that my giving her space would result in her wanting to come back. So far that has not been the case, and I have strong reason to believe she has several affairs going on. However, evidently MLC can take 2-5 or 7 years, but I do not want to wait around that long.
Good luck to 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