my dynamic is a little different. my wife is does not seem to be struggling with her detachment from me. she seems like she's already done it. I wish she was struggling with it. if there is struggling going on, she's keeping it under wraps. only once did I hear her say anything to indicate she was struggling at all, when she said she knows she's "being the bad guy" making me sad, and the kids sad, and other people too and she started to get a little teary. other than that, see seems comletely content and confident with her decision... or at least that's what she's showing me.
so I can see why your wife would get mad, if she was still struggling with her decision and detatching. i can see why she would say "see I knew you didn't love me." (but that is completely irrational if all you did was accept a friend request).
My wife, I think it's more like what a couple others have said. she would feel relief and less guilty. but who knows. I really don't know what's going on inside her. Maybe there is a part of her that is questioning her decision and I just can't see it. I sure hope so.
For now I'm going to be someone that only a fool would leave. It's not really clear what that is though, because this site seems to say I should be aloof, mysterious, almost playing hard to get.... but to me someone who only a fool would leave is a person who is caring, interested, and present. I guess that's one of the things I need to figure out next.