[quote Especially because I can see how stressed and unhappy she is much of the time - it's on her face, it's in her reaction to the boys, etc [/quote]
So watch for her to get real angry and you thinking what did I do? She's struggling inside and she is going to let it out on you, this is good. Be prepared, she nees to vent and you want to be the lightning rod. Do not match her emotions, stay calm, validate and be a pillar of strength. It's good that she is getting angry talking about divorce (numb=bad, anger=good). You are leading.
Your other issue about her staying committed until Retro. Doesn't the Hendrix book talk about a "no exit plan" (or something like that) while undergoing his counseling. Could you modify something like that for you?
Cheers
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.