Why do I still think of him even after I moved on?

It’s been 2 years and I still think of my ex an abnormal amount. We would keep in touch as friends in between those 2 years though. The last time I saw him was this summer when we were working a summer job together. I sometimes get the urge to reach out to see how he’s doing, even though I have no feelings left, and have both moved on. Why?

Why do I still think of him even after I moved on?
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