I certainly understand your thinking about being a plan B, but I want you to think about that for a second. Is it really a plan B, or is it a realization of the original plan A that would bring him back.
He's confused, not thinking straight, thinks he has the answers, and you and he have no idea how this will play out. But I think, imho, its not that his new plan A now falls apart as much as its a realization that he had the right plan A in front of him the whole time (you), he just needed to find it again. It can take some time, maybe even more than your willing to tolerate.
I think its important that you don't feel like a plan B thou, just that your husband has lost his way. Eventually he's gonna realize you ARE the plan A, he's broken not you. Don't down grade yourself, your a great person, im sure a loving wife and mother. Sure we all need some tweaking from time to time. You work on your tweaks, and let your husband fall and find his own. You cant do that for him, or worry about it either.
