Why it made me sad when a guy I rejected found a girl?

We were dating for a while. We kissed few times and went out. But then i rejected him. I know he was really sad and took him long time to get over me. I dont want him anymore but it just made me sad that he moved on and found someone else. I mean iam happy for him and wish him to work this out bit I just dont know why that made me sad that he doesn't want me anymorw

Why it made me sad when a guy I rejected found a girl?
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