Could that be interest? Or not always?

Girl I work with. When I told her I was leaving she seemed disappointed said she’ll miss me etc. later I was thinking of not leaving. When I told her I might not leave she got really happy. I wasn’t there but other coworker said she looked super happy and he asked why she was and it was because I might not stay. Could that be interest? I know she might like me as a friend but I was just wondering.

Could that be interest? Or not always?
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