Co-worker love?

Hi,
my female coworker has been flirting with me for couple of months (I knew she was into me). I really liked her as a friend but when she suddenly stopped being more in contact with me, I realized that I liked her more than just a friend.
When I asked her out, she agreed instantly but after couple of days she rejected the date and said that she considered me as a friend all the time (which was obviously not true; by the way. girls usually like me).
Maybe she was upset that I reacted too late. I was very busy during that time. What is your opinion?
Co-worker love?
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