Have you talked w/ your bf about the outburst? Have you asked him about his medication? I know that sometimes a bipolar person will have tantrums b/c their medicine isn't working or therapy isn't successful. Please ask about his mental health. This isn't something that he can handle alone when he's in a relationship. He needs to explain how he felt last night & advise you if he's not taking his meds or if he feels he needs a change in meds or therapy.
Not only has my husband begun to see his 3rd new therapist since we've known each other (6 yrs), he's had his meds changed several times. This is a situation you may want to discuss with his therapist...perhaps by making a joint appointment. I've been to therapy w/ my husband & his therapists in the past. It's always good to keep the lines of communication open. My husband has woken me up in the past when he's felt scared in the middle of the night. I'd rather he talk w/ me than act out in a negative way.
I hope that helps. Believe me, bipolar honestly can be managed, but it's not easy.

You can do it if you hang in there...otherwise, leaving may be the only option.
BYD