Hi lady, and welcome to SR.
You will find lots of information and support here among friends.
He's been through rehab, so he has the tools to seek and maintain recovery.
He's chosen not to do that. His dry spell are just that...dry. That's abstinence, not recovery.
Factor in the mental health issues, and his refusal to take the meds for the rapid cycling bipolar, and you are looking at a freight train out of control.
There are three C's to remember:
You didn't cause his alcoholism.
You can't control his alcoholism.
You can't cure his alcoholism.
Please check into Alanon meetings in your area for face-to-face support among those who understand.
Get the book "Codependent No More" by Melody Beattie. It was a real eye-opener for me. "Women Who Love Too Much" by Robin Norwood is another good one.
Alcoholism is progressive-it only gets worse, never better, if left untreated.
That part of you that doesn't want this life is trying to tell you something.
Again, welcome to SR, and you are among friends.