How Do I Break Up With Someone In Jail? Im Afraid To Break Up With Him..

I’ve known my boyfriend since 8th grade (2014) we started dating in August of 2019, but he did something really bad and got locked up. He’s looking at 3 to 4 years. I’ve been here for him since he’s been locked up. Sending him money EVERY WEEK, putting money on the phone, going to see his child, etc.. I’m just so fed up. I’m a 19 year old college student, no offense but I don’t need to be with a gang banger. I don’t need to be with someone in prison period.. I’ve been wanting to break up with him since December/January, but I’m afraid to. He’s constantly threatening to send his friends to my mom’s house and have them shoot it up if I ever cheat on him or if I ever leave him. I’m seriously afraid for me and my family’s safety I don’t want stray bullets flying into my house all because I made the bad decision of dating a bad person. Idk what to do..