This isn't bipolar behavior.
My husband and I both live with BP II and we've been married over 20 years without the toxic behaviors you describe.
I know you're attached and have had an investment in him; yet, I think you'll eventually be happier without him. Please consider getting a therapist to help you through this and to help you to figure out why you've been so locked in to this pattern with this guy. This will help you with future relationships.
Save yourself!

WC