Scared, looks like we are a couple of nite owls. Do you live on west coast? I'm feeling you and I are at same place with no hope. I can't give you good advice like the vets, but I've pretty much detached, he's so going to do what he is doing and nothing I do at this point will change his mind. In fact we are going into probably ugly negotiations about property settlement he will never feel positive about me. But I have to protect myself.
You should not be back seat to his kids. I think you are right about his guilt.
I also think he will have trouble with anyone new because he doesn't have his priorities straight. His kids will move on, they grow up and move out of our lives. Mine did. Hang in there and know people here care about you. Fondly