Holy crap JonF the similarities between your story and mine are crazy. My W wanted to leave me 2 months ago, then wanted back, then I found out about her ongoing EA, she tried to R and apologize, I imposed conditions for trusting her and now she says it is over for good.
Today she told me she filed papers and she has already moved out of our apartment. She raged at me for all kinds of things I didn't even do. My W has depression/anxiety issues and is on meds now. Would something like that be impacting your W at all?
Also, reading your sig line - my wife told me less than two weeks ago that she loved me and would never divorce me. Already she has completely left my life and is pushing me to sign the papers she had her lawyer prepare.
We don't have kids though so I wouldn't have any reason to talk to her after this is over.
For me the one change I've made is I've stopped arguing with her and I am trying to give her space and not call/text/email.
T 10 years, M 4 years, both 28 years old 7/3/2013 - W wanted D, we attempted to reconcile 7/20/2013 - discovered W's EA, attempted to reconcile 8/24/2013 - W told me she wanted D, filed papers