Yes, his behavior is related to his illness, but that in no way makes it okay.

I say do a trial seperation for several months, maybe a year, maybe longer. Give him some time to figure things out, get clean, get medicated correctly, get his head screwed back on straight. If he can figure everything out and really change his ways, then MAYBE, just MAYBE, you could take him back.

But for now, I think both of you need a split. I don't think he would focus on his issues if he's still with you.