3 month relationship suddenly ended with her saying that she doesn't feel anything for me

So I met this girl that was really open with her diagnostic telling me about it on the second date, the relationship was basically perfect, we never even had a fight or argument. The relationship started on June, that month was really good, July was also good but she used to get these sudden feeling of being down and wanting to go to sleep or be alone (that wasn't a problem to me). At the start of august everything started going down, on a saturday we had one of the best nights out and she confessed to me that she was starting to feel attached to me, then the next day on sunday we went out again, everything went fine and on the way back she started to have one of those episodes of feeling down and she just wanted to go back to her house. After that sunday she started to ghost me and barely text me for a whole week, a thing that was uncommon from her even tho she didn't text me that much, I told her that I wanted to talk with her because i was feeling that she was uninterested and I also noticed that she followed her ex back on both her and his private and public account (for context the ex was abusive so that was annoying and weird for me that she would follow him back). Then she told me that it was okay if i told her what i wanted to talk about on text so i sent her some voicenotes explaining the situation respectfully and not wanting to fight. After that she just answered that she didn't feel anything for me and that this thing didn't feel okay with her.

I know that this is normal in people with BPD but i just wanted to kind of vent and have some advice if she comes back