Want my ex back. Advise ?

Basically we kind of stopped working for our relationship. Life kind of got in the way and we were bored. But I love him so much and we are so great together. We are in school and he is currently dating one of the schools (sorry for the term) “nasty whores”. She dated one of his friends so they were mutuals and now the are together. 🤮 How to do show him that I’m better for him ? Even people in school say that I’m way better ! He just gets angry. Help !!!