I agree with others that you dodged a bullet. It sounds to me like she may had a personality disorder, and I say that as someone who does have a personality disorder. The way she started sharing really intense, personal information so soon is a common red flag, it creates a false sense of emotional intimacy, and often the person with the PD doesn't even realize that that's what they are doing because they so desperately want to fill that emotional hole in themselves.

The next telltale sign is that she started running cold as soon as you, too, turned out to be a human being with past and present struggles of your own. Commonly a person with certain PDs is like an emotional vacuum or black hole. Not only do they get very serious and personal very quickly to create that false emotional intimacy, but they also feel a psychological need for you to basically play the role of their personal, infallible, robotic therapist. If you have emotional needs of your own, it just freaks them out.

Based on the details provided, I honestly think it is very unlikely that she dumped you because you have bipolar disorder, and much more likely because she is a dysfunctional emotional black hole and can't handle a real bond with a real human being.

Again, just my honest 2 cents as someone who has self-aware BPD, myself.