I don't have much to add to the thoughtful comments already posted. But I remember what resonated with me when I first became part of SR.
It will get worse. You may look for a sign that is hopeful and think things are going better. But he is on a downward spiral and will take you with him. Don't go. No matter what you do to try and fix him, it won't work. Take care of you. Take care of you. Take care of YOU!
I'm sorry that this is what you are dealing with. I'm glad you've come here because we get it. We care about you. Keep posting and be safe.
Hugs,
MamaKit