What Do You Think It Is? Schizo? Bi_Polar? Crazy? Addict?

My boyfriend who is addicted to methamphetamine and uses regularly, has some of the most extreme mood swings that I have ever witnessed. He told me that he has always been this way, even before using meth. (I’m sure the drug has enhanced all of these moods.) He can be happy and “in love” with me one minute and then literally turn around (sometimes only a matter of minutes when nothing has happened or nothing was said) and become outraged to the point of violence at times. I’ve seen him change other moods as well, such as violence turning into a weeping cry of “please, I don’t know whats wrong with me, don’t leave”. He said that after these outrages he feels a weight being lifted off of his shoulders yet he knows its wrong. This happens frequently! He’s either happy and content with life or hes agitated and ready to explode, and NOTHING in between. No medium with him. Please help. Best answer will be picked.