Why do we feel the need to be sad a couple months after a breakup.

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I don't want him back, it was an awful, pointless relationship, that I still get mad that I was even in. But I found myself stalking his FB over his new girlfriend. I would not get back with and its really stressing me out that I subconsciously check him out from time to time. It's not a very recent break up, I am just so stressed out that I do this !!