Mikey don't be such a dick.
Go find your own BPD ginger :P
Cain: You're a stronger person than I am for wanting to make it work (yeah, I'd do what Mikey suggested, but you're not me and I'm not you.) Cricket's advice seems pretty solid. I lol'ed at the vid. I keep forgetting how girlie girls always bow to the authority of The Therapist and Oprah. I don't and it's probably a class thing. That must be why they keep calling me cray. lol
Just this once I will ask if she or both of you might consider therapy. If she's bipolar, the correct meds will make her nearly normal. BPD... not so much. Have you tried suggesting therapy to her?
In the meantime, are you sure she's not just reacting to somebody pushing her buttons all the time? (Whether he means to or not ;))
You can cushion the impact of things you say all the time and may be unaware of by switching up the things the 2 of you talk about regularly. The subject matter if you can. But also just the words. Frame the things you say in a different way and see if she reacts differently. One day, pretend you're talking to your grandmother. The next day pretend you're talking to your pastor (for example, not necessarily those specific people. Just a gentle or feminine person who is not your gf.)