My ex was diagnosed with bipolar around 10 years ago, but as I was reading about it I also heard a bit about people who were wrongly diagnosed with it instead of BPD. I dont know much about it, but I know that his whole life is a mess. Not going to therapy, not taking his pills, using drugs and drinking heavily.

Could you please help me understand BPD a bit? Any typical behaviour for someone with his lifestyle who is doing nothing to get better? Any clue on how to tell if it is bipolar or BPD?