Heartbreaking.
Facts: He is done. Somehow, you knew and needed space to synthesize what you knew was not working. He perhaps had some time to think, too.
It looks like this; He is adjusting to the new situation quite happily, and much sooner than you anticipated, if at all. He took the invite by the horns and ran with it. He cannot keep you from your things, so you will need police to stand there while you and your friends take your things out.
He wants a new start.
Often people don't see how much has changed until they are forced to change with it. Sounds like he found peace and power in it all. My ex H did the same.
He also said, "I'm hungry. Fix me something to eat." (toad)
He had nevvvvvvvvvvvvvvvvver done that.
I played the ditz, and said, "Oh? What would you like?"
"I don't know. Surprise me." (and, that I most immediately did!)
"Well, what do we have in the fridge?"
"There's some hamburger and vegetables. I don't know..."
Then I said, "Hmm. Ok. So as long as you know what's in there, get up and make it. I'm busy from now on."
You will have to roll with the changes. I am sorry you are going through this.
Don't judge his actions, movements, words, or lack of caring. He will be completely abrasive. Your best bet right now is to get your affairs in line, don't apologize, but just operate as if it is already a year from now.
Do you have friends and family who can help you and support you for the time being? You are going to need it. Change all your passwords as well. You will be so glad you did.
Also, ignore him. You are as good as on your own now, and most likely even better than that.