Should I quit my job working with my ex?

It's been 5 months since he broke up with me. I'm OK working with him, we can talk and work professionally, but I always cry after work realizing how much I miss him and how we used to be. It's too much work to be mad at him because all he did was tell me he didn't feel the same way after 4 months.

I really would hate to leave my job. I'm friends with a lot of my other co-workers and generally is a fun environment. We just have to work really closely and getting over him is taking forever.
Should I quit my job working with my ex?
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