Why is my former crush acting awkward after they rejected me? Am I the problem?

A year ago I decided enough was enough and confessed to them. As expected I get rejected and I wish them the best of luck and left them alone. They said likewise. I cut off all contact cause I don’t want drama. Here is the issue: now that we see each other every week they avoid eye contact, or they will stare at me or whisper a hi. I have never had this issue that is why I’m asking.

Why is my former crush acting awkward after they rejected me? Am I the problem?
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