EX AT SCHOOL

so we have been dating for almost 2 years when we broke up he was a douche . We promised not to post petty stuff and he initiated it anyway, when he treated me bad and stuff. The point is we see each other everyday at school we have 3 classes together and we haven’t seen each other since winter break started. How should I act with him? I removed him from my social media’s Bc he was trying too hard to hurt me ig like getting me jealous. Should I ignore him? What should I do?