Can you give me advice please?

There is this guy in my class and he always teases me. But yesterday he was throwing hand sanitizer (bottle) at me, so i threw it back. He kept on doing it and so did I. Then I left it where he threw it for 5 mins then he went and picked it up and he started it again. Then the hand sanitizer bottle broke and I just went to put it back without fixing it. But then he cared enough to try to fix it so i didn't get into trouble. At the end of the day I found out that my brother and him were friends and I said y'all can't be friends (jokingly) then he said "your just mad because I am smarter than you" And then i blushed and walk away but i turned back and he was still nodding his head so then i shook my head.

Can you give me advice please?
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