Help!

I've been with my boyfriend for almost a year. We were very happy for most of the time, but he sometimes turns very jealous and irrational. He thinks I might be cheating when taking care of my sick father at the hospital. But the next day, he trusts me with his social security number! A usual situation is, we wake up after a good nights rest, happy and smiling. We didn't do anything stressful the night before and both have the day off. I ask if he'd like to go to brunch and he cheerfully replies, "yes baby." The next week the situation could be EXACTLY the same but his reply now is, "no! I don't wanna go to brunch, I can't screw around all day, I'm not made of money."

We don't fight over finances, we both make a lot and we split everything. We don't often go out. 

I don't know what to do. I can't tell when hes going to lose it and I'm not sure if he has MPD or is Bipolar, or what. I love him but he almost turns into another person sometimes and I hate that guy.

He also takes Bupropion but is convinced he doesn't need to and that seems to be when the outbursts occur. Please help me help him. I don't want this to destroy him even though it has mostly destroyed us.

Thank you.

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