What do I do?

I was dating someone, and his car broke down. My mom paid $200 for him to get his car towed so that he would have something to drive to his job other than my car that I let him borrow. While his car was getting fixed, he wrecked my car. Then once he got his car back he admitted to cheating on me and dumped me. I've been trying to get him to pay my mom back the $200 he promised to pay her. He has since blocked me on everything. So I went to the girl he cheated on me with. She said she'd talk to him about it. Then told me to never contact her again and blocked me too. So I went to his mother. Then she blocked me. I'm out of options, down a car, and my mom is down $200. WTF DO I DO.