Girls, Why do you stare at a guy without smiling even when you have a boyfriend?

shyguy1886
While working away I happened to look up and I noticed an already attached female colleague (who I like very much admittedly) was already looking at me while at a distance, her body was facing different direction with her head turned facing me without a smile on her face. She was definitely staring at me as no one else was around in my vicinty, we both stared at each other for probably at least 3 seconds without either of us smiling at one another before I continued with my work. Why would you girls do this, regards.
Girls, Why do you stare at a guy without smiling even when you have a boyfriend?
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