I won't tell you what to do, since the decision to stay with him is up to you.

I will tell you that being with someone who is hypomanic (like me) is not easy, but it's possible. I've been with my guy for over 5 and a half years now. He can put up with my hypomanic episodes. Mine are worse because I can be happy and joyful one day, and then evil and vindictive the next day. No reason needed.

If you can make your guy's life more stable, the hypomanic episodes with be less severe and less frequent. The best thing you can do is to remain calm, or you will flip a switch in his brain. Then he would want to break up again. Make sure you convince him to removes most, if not all, stressors in his life. A balanced life for him will equal a balanced mind. (Hopefully). If not, we need plan B.