Off and on and off and on

My relationship with my boyfriend of 3 years (which i have a child with) is complicated. I've been cheated on and dumped in the middle of the night several times. Will it ever get any better? My situation is axiety ridden. i love him to death do us part but i'm not sure it goes both ways.
The reasons for the many breakups (last one was a couple of weeks ago) is me. My bipolar and shoplifting behavior. Is this normal? Does this happen to a lot of you? I know it isn't healthy but I dont want to end it. Is it me?

It might help you to make sense of the situation if you could talk things over with a therapist. Are you in therapy?