I am losing my mind.

I’ve recently shared a post about this guy that I’ve been with for like a month. He told me he cheated on his wife before and during their marriage, and then slept with multiple married woman after stalking them. Last time we had sex he started talking about my mom’s best friend, leading up to talking about my MOM. I tried to ignore it even though it felt horrible. I told myself maybe it’s just a harmless fantasy thing or whatever but today he told me he sent a friendship request to my mom on instagram from his fake account. My heart is racing at this point and I’m disgusted and don’t know what to do