I wanted to add that in my opinion, if he's not having an affair yet, then you are probably in a better position to DB than if he is in one, although some divorces are busted even with affairs. My sitch is one of the "rare" ones MWD talks about where the spouse is "firmly out the door" and nothing works. At least short term. Maybe in a year or so when my H realizes his mistake things will change, but I really doubt it. I hope that in your case your H isn't so stubborn. The ring still staying on may indicate he is confused more than decided.
M45 Bomb 6/09; EA 6/10; Divorced 1/11 Proud single mom of 7 little feline girls and one little feline boy "Fall down 53 times. Get up 54." -- Zen saying