Girl I used to date upset that I don’t want to be her friend?

I used to date this girl at work I tried to be her friend but it didn’t work out. I told her we couldn’t be friends anymore. Now ever time I see her she always stares at me. Why does she do this?
p. s she told me she already moved on but I don’t think she did.

Girl I used to date upset that I don’t want to be her friend?
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