Hi Riko,
first of all, I'm very sorry that you have to go through this. That's really tough.
I cannot tell whether this is BPD or something else, but as Moby already said, right now it doesn't matter, as you should make sure you stay away from her and come to yourself again, which you apparently already do.
However, finding out about what is going on might help you to see that this is something that has been examined, and shows a pattern. That helped me with my ex-bf. If that helps you too, maybe do some research. BPD and other mental illnesses are comorbid very often as well.
But please consider what Moby already said: It's not you who did something wrong, it's her. Their brains are wired differently than ours. It makes no sense, what they say and how they act and I can tell you there’s no way we will comprehend that anytime, so don't even go down that rabbit hole, please.
The question is not: "What did I do that she hates me so much?"
But "What is wrong with her that she hates me so much although I didn't do anything?" And the answer is: A lot. And you won't be able to fix her. Just make sure you get out of that with at little damage (emotionally, physically, financially) as possible and never return but move on.
We're here to support you.