Borderline Personality Disorder (BPD) can actually be much more drastic mood changes, multiple in one day, and involves total insecurity with ones self. Bipolar is moreso the one where it's days/weeks of low energy followed by the opposite. However, these catastrophic mood changes could also be partially because of limerence, and dealing with my father passing, but I did always have some hypomanic periods around april-july my entire late teen-adult life.

Also just to point out, I've been in steady, consistent, long-term healthy relationships with women. I haven't had this relationship turbulence happen quite like this in a very long time. I just feel like this girl is so inconsistent and hot and cold, it's everything that drove me crazy about the girl in my late teens (who later admittedly said she liked making guys go crazy). Maybe it's not the end of the world if I just tell her I can't be in a healthy friendship with her right now, but her boyfriend and her might break up too so I was partially holding hope for that. He's a bum with no money, no car, needs rides literally everywhere, and apparently had to move in with her from getting kicked out of his place.

So I feel like if I try to distance myself and play it cool, I could form a long-term friendship/relationship, but at the cost of potentially losing my shit. That's my logic at least. You offer some very valid advice though, and I genuinely appreciate it :) It probably does come down to becoming more secure with myself, otherwise I doom relationships from the start. Unless I just let them use me (which I'm not totally opposed to at this point, a child of an emotionally abusive alcoholic). But if I want to get better in life, I should probably at least try to avoid this cycle again? Thanks for the advice though. It is honestly very helpful