How can I move on if my ex is my classmate, I want to feel happy?

i miss him, our conversations... i know its far from over, he has a new girlfriend... he probably don't care about me at all... its been 4 months... but i feel still stuck on it... watching him everyday especially with her... i just want to feel better and move on...
How can I move on if my ex is my classmate, I want to feel happy?
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