That being said, I'm very confused about your relationship with this person. If we are talking about an SO, then you have to decide if you want to put up with these problems, adapt to dealing with them, in your life partner. If you're in it for the long haul, you have to learn techniques to help them remain as calm and untriggered as possible, probably without their knowing it. If it's just a friend or acquaintance, then you have less responsibility, less exposure, and even less control; in that case, decide if this person is worth the stress they cause by being a friend, accept them exactly as they are, and either remain their friend, or walk away.
Yeah... . that's complicated. He's my business partner. I can limit my exposure to him (which I have) but I cannot walk away from the situation. Even if I was to close or quit the company I would STILL be exposed to this situation because we all work in the same industry and it's small. The only way to walk away would be to completely leave the industry, or move to another city, which is something I don't think is really realistic or viable. I love my job. I have a great professional reputation, a strong network, lots of achievements, influence, etc.
More to the point, our relationship is usually pretty stable. Dealing with him and accepting him is not a problem. Especially now that I understand what is going on. Prior to this I did kick up a fuss based on the decisions he made, but even those conflicts were relatively light on drama. The occasional argument or temper tantrum, blows over in a few hours or a day. I am rarely if ever painted black in his mind.
He seems to be at least somewhat self-aware. I mean, he's told me about his depression, the sudden unexplainable anger. He understands that these feelings are out of whack and that he abuses alcohol to regulate his emotions. So for that reason, while I understand that I need to remove myself from the situation as much as possible for my own sake ... . I'm hesitant to give up so much of what I love to get rid of these people.
The problem with saying I shouldn't be angry at them because the pwBPD is the one hurting me is that... . he really isn't. I'm not mad at him for spending time with them instead of me. I'm mad at them for abusing and taking advantage of him. It's like watching a bunch of people beat up a blind person.
Let me give you an example of what's going on: His gf has this one friend who is constantly nagging pwBPD about going out drinking with him, like two or three times a week, multiple bars. A lot of times pwBPD will say no, but gf and friend will bully him and pressure him into coming out, playing on his fears of abandonment to get him to go along. A couple of months ago I ran into this "friend" at an industry event where he-- in the process of introducing me to someone else-- started laughing about how pwBPD was such a massive alcoholic, how pathetic he was, etc.
The friend does not know about BPD, does not consider the possibility that pwBPD might be sick ... . but bullying someone you think is an alcoholic into going to bars with you when you know they don't want to is still AN ABSOLUTELY AWFUL THING TO DO. And then talking about it at an industry event where it will affect his career and reputation? For real?
I'll be the first person to admit that pwBPD can be hard to deal with when he's dysregulated. I don't have many problems with him because of my past experience with my brother. Even before I knew about BPD I found it pretty easy to just ignore much of the stuff other people find so frustrating.
But even given pwBPD's responsibility in this situation, what they're doing is still unforgivably awful.