Why do I cry over my ex and get sad and depressed over him?

He broke up with me and went back with his on again off again ex girlfriend and he's been with her ever since, and I always get sad and depressed over him and think about him late at night all depressed and I feel like killing myself over him. Also, I think and feel like I can and will never find anyone better than him, like I'll never find my true love, etc. And sometimes I cry over him. I feel like I will never get over him too.
Why do I cry over my ex and get sad and depressed over him?
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