The vicious cycle of BPD

Constant arguments. It's been over a month now and every single interaction we've had is argument after argument. She says what she wants, and I do it, but then she finds something else to be angry at me by. I feel like I'm losing my mind. Or, even worse, she doesn't tell me what she wants/needs and blows up when I guess wrong. My closest friends and even my boyfriend (who is never one to tell me who I should/shouldn't hang out with) have been practically begging me to let her go, but for some reason I can't.

I feel like I'm losing my mind though, because if I try to summarize any of my incidents in other subs, I get downvoted to hell and back and armchair Reddit psychologists tell me I'm lazy, a bad friend, etc. etc. etc. I'm starting to think I'm the issue, but when I clear my mind and go back to our arguments, I really do thing most of the time the "conflict" is just me defending myself or setting a gentle boundary. She's always used to me cooperating and going along with everything, so when I don't, it causes massive arguments where she calls me abusive and insinuates horrible things about me. But every time, I leave the argument half-wondering if she's right. Ugh