My BF insists IM a pathological liar (20F 23M)

My (20F) boyfriend (23M) insists i’m lying and has since the day we met. I told him i’d work on it with him because we get along together so well. Fast forward 8 months later every day i wake up i wonder what he’s going to be upset about today. He insists im a liar over everything, he has a very black and white way of thinking, so if something doesn’t make sense to him he just says that my actions contradict what im saying. Sometimes i’ll sum something up to him and when he notices a slight “change” in the stories and he will say im a liar and that the story is changing once again. He gets very upset thinking about my exes and things I’ve done with them (financially irresponsible things from when i was unmedicated bpd and bipolar), and insists i was obsessed and that he isn’t special. He’s started calling me a bird and saying that was his worst fear. I love him so much i have no idea what to do. He’s hurting me a lot lately. The craziest thing is i’m not even lying. He makes me feel like i am though. He’s said he doesn’t want to go to therapy or the doctor too.
He also has had a very supportive family growing up and I’ve been abused my whole life, and he doesn’t understand how i could make such mistakes. How do i handle this?l