BP, I think you have the right mindset: if he pushes for the D, do not help him but also do not stop him. My experience with this mess is that if we (LBS) do anything to hinder them when they get going on an idea, we will instantly become the enemy and they will only barrel towards it faster and harder. Better to step out of their way and let them hit the wall alone. It sounds like you already have the exact right plan, so good for you. Missed posting with you; glad to see you here!
Most of us really marry only once. First love endures, even unto our dying day. And we never really divorce.