My sister's boyfriend is making fun of me because he is insecure about my looks

My sister's boyfriend, who is in his mid 30s, is making fun of me, my looks, my weight, and my relationship status. He is trying to get my sister to dump me and live with him. She doesn't care about me at all, and is just trying to get rid of me so she can be with him.<br><br>I am a 22 year old man with a 5'4" and 120 pounds and average looks. I am also gay and don't have a partner. My sister's boyfriend is a 36 year old man who is tall, muscular, and has a six pack. He has a very attractive face as well.<br><br>He is insecure about my looks because he is afraid that I will steal his girlfriend or girlfriend away from him. He is afraid that I will become a threat to him and take away his attention from my sister.<br><br>I am not trying to steal his girlfriend or girlfriend away from him. I am just trying to protect my sister from his toxic behavior.<br><br>I am worried that he will try to hurt me or hurt my sister if I don't stop. I don't know what to do.<br><br>I don't know what to do. I don't want to hurt anyone, but I don't want to be hurt either. What should I do? Should I go to the police? Or should I just ignore him?