There are specific medications for bipolar disorder that can make a huge difference. If he doesn't want it on record, there are ways to get medications "off record" via the internet.
I'd try to talk to him and clarify where he thinks this "bipolarness" is coming from. A true disorder, or things left unsaid?
Its still really good that he apologized and owned up to his behavior. I would see that as a baby step in the right direction.
