I think also, though...

It's kind of important to figure out, what would be gained if you could figure out through all the research and such, that you were absolutely sure he WAS bipolar?

What would that change?
I'm not trying to be hostile in asking that. I am genuinely curious.

I almost feel that even if you knew for sure, it might almost be more difficult to approach him with your concerns.

How have you tried before?

I am not actually familiar with your situation, so I can't comment one way or the other.

I guess I'm just wondering, in the end, what all the research will do to help him. Again, that's not a hostile question, but rather... what's the end goal of that?