Sounds like a good move.
I doubt that he believes half the stuff he says to you. He's simply, as you said, being abusive and mean. He knows how to hit you, emotionally, where it will hurt.
If I were you, I'd just quietly go ahead with your plans and don't engage with him if you can possibly help it. Do you have a plan in place for separating? If not, I'd get busy on it.
Hugs,