Problems

Okay their is this guy at my school I liked and dated he broke up with me😭. I'm over it but I still like him I don't know why but I do. He told me over winter break he liked me☺️. But then a few days later he took it back and know that I'm back at school I don't know how to act around him. I mean should I flirt or ignore him maybe try to talk to him I just really don't know. PLEASE HELP