That's not exactly true. All psychopaths are not bipolar, and all bipolar people are not psychopaths, but there is a statistical correlation between bipolar and psychopathy. 16% of adult onset bipolar people are also sociopathic/psychopathic. The percentage gets much higher the younger the onset of bipolar, with childhood onset bipolar having a 37% correlation. The baseline is that 4% of the general population is sociopathic/psychopathic

I think the gist of this is, and I'm pretty much repeating what a lot of other posters have already said, the guy is an asshole. Whether it is because he is bipolar or psychopathic or both is moot, he's still an asshole and you can't do anything about that. Leave, sooner rather than later, and don't look back.