How to get over a guy who ruined my self esteem ?

There's kind of a long back story but essentially I(19f) met this guy in a class at university. After that we met up a few times and sometimes made out with each other but then we didn't speak for about a year.

Out of the blue, he messaged me and we ended up meeting up and going for a drive. I don't want to go into details but he knew that I used to have feelings for him and whilst we were talking in his car he would say things that were quite insulting to me (mainly about my appearance but also a bit about my personality). After this, I skipped university for over a week and kind of isolated myself in my room because I felt too insecure to be seen by anyone and I cried more than I'd like to admit lol.

I dont know what to do anymore. I blocked him (and don't see him at uni bc he skips it all) but I still feel hung up and affected by what he said to me. He is the only boy who has ever shown me any type of attention.