Why does this coworker light up around me but ignore other guys?

She works in the same building as me. She ignores all the other guys. But with me she always lights up and talks to me. The other day I had to call her fee times in one day about work related stuff. Anyway I made a joke with her saying " you must be sick of hearing from me by now". Her response was " aww no, i wouldn't get sick of it"

Why does this coworker light up around me but ignore other guys?
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