Hello vulnerable,
It must have felt confusing when she started pulling away from you. It's really hard to get a gauge on things as well when you don't see someone in person, which also gives us a chance to pick up on body language and other cues.
A pwBPD (person with BPD), in addition to living with emotional dysregulation, also suffers from a core sense of shame. It's probable that when she said that she causes you too much pain, that her interaction with you is what triggered it. You became a trigger for her pain. She brought that with her, and she takes it with her as well.
If you have Rescuer or Caretaker tendencies (me, too), then you may feel badly, since you were sincerely trying to help her work through whatever messes she had in her life.
Are you still in contact, and if she reaches out, what does your gut tell you to do? We can help you with this, and I'm glad you found us.

Turkish