I'm sorry you are going through this terrible time - I do have an understanding of what you are going through, as I went through something similar (Except we were BOTH BP!)
I'm concerned you say he's on an anti-depressant; is he on a mood stabiliser too?
Else it is quite possible that the anti-dep has pushed him in to mania. Not sure how to explain the fact that he was OK for 10 years, but maybe something triggered him.
He should go and see his pdoc to review his meds - urgently

When he's manic, it could be quite possible that he does things that are totally out of character; and he sounds like he's not really in touch with his reality any more