Keeps bringing up past?

My bipolar husband who stopped his medicine always brings up the same things from the past when he didn’t even know me. For example he is going off because I told him I didn’t remember having sex pregnant (10 years ago, ex husband) I literally didn’t have sex those nine months. I stayed with my parents and my kids father at that time worked far away never was home and I was despising him. He says I’m a liar etc. he also brings up my other past relationship a lot. Tries to create the biggest arguments ever. I’m so tired of this bs it’s ridiculous! He does this every other week!