Your girlfriend has bipolar and she is always mad at you what can you do?

First, suggest she sees a doctor if she hasn't already. Second, suggest she take a medication to lessen the side effects. Again, if she's bi-polar she probably already is. If she's not, try to convince her to do both of these things. Thirdly, counceling may be an option. It's usually helpful if you both go for some sessions and she has some sessions on her own.