MT, I don't know. I guess I would try to ask him questions about why he is doing that right now. He probably doesn't even know himself. I think I would just be kind to silent, thinking about things. I don't think he is going to have any logical answers for you because nothing he is choosing to do makes any logical sense.
Just be you, breath, bake and decorate. Shop, meet friends, sleep, cry, breath, talk to your family, breath, pray and give your dogs lots of hugs. He has to process this stuff on his own. Don't try to help him. Remember your boundary. Read the book Tough Love. Keep DB'ing and keep your door open. If/when he pulls his head out of his a$$ and clears the sh!t our of his eyes he will walk back thru your door. He then will be ready for the R talks.
Most of us are about as happy as we make up our minds to be.