Me and my boyfriend broke up and have a cl together at our college...how should i handle that? It sucks!!?

He goes into cl and makes it a point to be really active in it and speak a lot, and tries to crack one-liners every chance he gets, and tries to make me feel bad like he doesn't at all care im there. We dated for about 2 years and idk what i should do to help me not care that he's in my cl? It's midterms now but i still have a month and a half of this!!!