Soooo, he decides to act like an a*s and be totally neglectful and he blames you for his doing so? How's THAT work?! Nope, that one doesn't fly. You are not responsible for his behavior. Not now. Not ever. Not with BP. Not without. He says you "make" him that way? Uhhhh...
It's bad enough he's trying to use your BP as an excuse for his behavior, don't let him catch you up in that BS. It's much to his advantage to get you to believe it's your fault. And the seeds of self-doubt have already been planted... "(in part)" "...but maybe after years of depression...". I'm not sure if this is a situation of "gaslighting" exactly (because I'm still just starting to learn about it), but it sure seems like it could easily become one.

It is good that you are doing a reality check. It's all too easy to self-doubt and come to believe things that really aren't so, especially when one is overworked and stressed out. What route you go with that information is completely up to you of course.

In answer to the question of your thread title... imo, the BP might not be helping, but there's reason 'aplenty for situational depression here. As Trippin' pointed out.... even a saint...

And we're talking even St. BP-less.