My girlfriend is diagnosed with BPD, and I've learned some stuff about it as a result. The main thing you should know is that therapy can really help with BPD. My understanding is that many people with BPD can be treated with just therapy and no meds, and generally there is a high success rate.

My girlfriend started therapy before we met, but from what she has told me she is doing a lot better as a result. A lot of time, people will share awful stories about relationships where on partner has BPD, but ours hasn't been like that at all. I think we're closer because of the way that she has practiced self awareness, and also because she is very sensitive to how I am feeling. It's honestly wonderful to have someone care about me like that. I do need to reassure her sometimes that she hasn't done anything wrong, and I won't leave or anything, but it's not hard to do that because I really like her.