She turned me down but still acts interested?

I asked this girl out from work, but she said that she was talking to someone else now and that she wished I had asked her earlier. Thing is, she still stares at me from across the store and smiles at me. I told her to let me know if things change and that I'm still interested in her. What's with her still giving me looks and the like if she turned me down?
She turned me down but still acts interested?
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