Why did he reacted like that when he crossed my way?

So i know im overthinking, but i really would like to get some opinion and assumptions from you guys.

at uni we have IT assistants and me and my group once went there cuz we had some problems with the laptop. I felt very attracted to the guy who helped us out

anyways i saw him in the hallway last time and he recognized me and smirked to himself while looking down the floor. It was a bit of a naughty smirk...

im wondering what about me has made him smirk.

-Maybe he just recognized me and did this. Soem peope are like taht and he is confident

-maybe i came across a bit too strong even by the way i vent about my problem taht night and he noticed im a bit lusty for him. Which im ashamed off.

-maybe cuz im a girl and he finds me innocent cute. It was a bit of a "hehe girl"-smirk.

-maybe i looked funny just didn't know

whatever it was i dont zhink he woudl have done taht with a guy so i woudl really like to know what was going through his head.

i would really appreciate some serious answers thanks

Why did he reacted like that when he crossed my way?
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