Working with someone after a break up? Should I leave my work?

Anonymous
I did everything in my power to not go back there. But I need money, and I am working there and looking for work at the same time. Basically he kept blowing me off never keeping promises and I got mad at him and called him out. We made up and then the next day he stopped talking to me litteraly going the opposite direction when I was coming. Ignored me. And I tried to talk to him so we could be on friendly terms. Turns out he is dating some 19year old and is happy and she works with me. And now he won't even look at me inthe face won't acknowledge my presence in a room, and it hurts like hell.

I don't know what I should do. I feel humiliated and I know about the girlfriend he never told me, he just acts like I don't exist. He is 23 By the way. WHat should I do?
Updates
+1 y
Im 22 btw.. not 30 I can't change it lol
Working with someone after a break up? Should I leave my work?
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