Wow, just wow. What a pos. What is it with the “6 months”??!! These WAHs need a kick in the nuts.
I second Alison on going dark. As much as you can while still living together. Shut him down when he wants to share his feelings about AP (or anything) with you. Eating dinner together everyday?? What planet does he live on?? I would NOT allow that.
With that said, that is not easily done when you have kids around. They will have questions. Are you ready to break the news to them? “Mommy and daddy are having some problems right now, So daddy won’t be joining us for dinner.” “Daddy is staying in the basement because we need space from each other to figure things out.” You shouldn’t do the heavy lifting of talking to your children about it, but you are the only sane parent right now. Maybe you need to prepare for the difficult conversation.
Hugs. You are strong enough to get through this. With or without him.