I have comorbid BP and BPD. I was miserable in relationships until a few years ago. I think having a steady, level-headed partner helped me. One time I was in T with him and telling him I wasn't good enough for him. He and T told me that yes I was, and in fact it was long overdue to have someone who is nice to me. Sometimes we don't see our good qualities because the self-talk has been bashing us over for so long.

Happiness may not last, but it will come back.