You need to go completely NC with him except for the very brief, necessary decision about division of assets for your divorce. No other reaching out, no other contact, nothing.
Giddy, he's fired you as his wife. He left you to go live with his GutterTrashHo. And the OW is going to take him for ALL he's worth. You need to protect your assets because he is already spending YOUR money on HER. 1/2 of all the money that he is using to finance his rainbow-fart land-o-glory is yours, so in essence, YOU are being ripped off. That has to stop. Immediately.
He's angry, because he f-ed up and has to blame it on someone. And that person is you. Because he's too much of a coward to admit that he let his lower head do the thinking and now he's facing the consequences of losing his family, his lifestyle, and everything else that he's worked for all of his life, for a woman that will have to be buried in a Y-shaped coffin when the stake is driven through her non-existent heart. SOMEONE has to be blamed, and since it couldn't possible be him, it has to be you.