Advice needed!!

I met this guy 4 years ago and we recently got back in touch. We've been talking for about a year since getting back in touch. He tells me he loves me and won't be with anyone else but he constantly puts me down when he's upset. He's bipolar and has anger issues and I understand that but I tell him the things that bother me and he seems to ignore me. I feel like I don't deserve this but that it's my fault he gets so upset. He goes back and forth between saying he's never going to talk to me again and it's over between us to him not wanting a life without me. I'm not sure what to do.

Any advice? I would greatly appreciate it.