Just got out of a breakup from a five month relationship which was absolute hell with constant thoughts of abandonment and paranoia of cheating, I tried to stick it out for way longer than I should have and it's going to take me a long time to recover emotionally after a couple of very triggering events, but I think my BF had BPD too. It's hard to explain and I can't tell for sure but a lot of his behavior/mirroring of personalities matched what I do constantly. We're not talking anymore. Fuck. We both shared extreme black and white thinking and I was the one putting him on the pedestal as my FP while he was avoidant. Fuck.