It is nauseating. I'm sorry that it is even part of the situation to imagine D. It honestly sounds like you think it might be inevitable. It just sucks and I wanted you to know that of all people here I understand how badly you want a second M to work. I think the work I am willing to do in my second M pales in comparison to what I did to save my first and that was a 10 year M with seven of it alternating between mild misery and pure hell. Hugs.
That being said - Mrs. HD has some responsibilities to this M too. Some of them are, in fact, related to affection and sex.