Mom doesn’t trust my boyfriend 😭😭

Okay so my mom doesn’t trust my boyfriend. She hasn’t even met him she just automatically doesn’t trust him thinking that he is going to “rape” me but honestly he has never even said anything sexual to me. She told me that if me and him ever want to go on a date I have to bring my YOUNGER SISTER with me so that she can “supervise” us. I confronted her telling her that this was wrong because she hadn’t even met him but she just got mad. I honestly need help, any tips? 😭😭😭