
I'm sorry to hear that you find yourself in this situation. I think that we can all relate to feeling some of the "unhappiest times" in our lives in our relationships with a person with BPD (pwBPD).
Perhaps if you provided us with some more details about where you are at in the relationship it might help. Are the two of you still a couple? Did one of you end the relationship, and if so who and how did it end? Where do you want all of this to go?