Quote: I told him that he needs to take this time to make a decision, a definite decision, as to whether or not he wants to give this M another try. He said he would do that.
Everything you've been doing that's making him say, "You're acting so different. You don't need me anymore?", plus his guilt and the crash of his reality, has brought him to this point. Telling him the M is still viable could be a bit premature on your part. It may be the reassurance that he's seeking that you're still there for him that encourages him not to worry about it. Let's hope he doesn't retreat now that he knows you're still open to it. If he does retreat, become indifferent, doing what worked and do not show signs of wanting to work things out if he approaches it again. If he doesn't retreat, take it real slow, do not show enthusiasm. Let him work his way back until he's in real deep for good.