Hey Anonymousx, welcome to the boards!
It sounds like your relationship has been very confusing and hard to manage at times. Obviously you care quite a bit about her. It's not unusual for a person with these personality traits to make rash judgements like your ex has here. These don't reflect on you as a person and they are not your fault, they are simply how she is feeling at any given time.
pwBPD suffer from large abandonment and engulfment fears. One second they need you around, another it might seem to them that you are too close, so they push. I know that all of these behaviors are difficult to understand. They run counter to my logic, at least. I can see why you are distressed. It's alright to think about what happened, by try not to ruminate too much. It sounds like you care about her a lot and there is absolutely nothing wrong with wanting to be with her again (we have a whole board here for that!

), but there is only so much you can do to help until you begin to sacrifice your own needs.
What do you think that your next step is in this situation?