Why this pretty curly guy stared at me from behind at my face?

I was talking with my mom and he turned around and i saw him staring right at my eyes and couldn't take his eyes off of me... I looked in a different direction then again at him he was still looking at my FACE! After that his head turned and followed me until i left and i saw that with the corner of my eyes then looked at him for the last time he smiled at me and i left lol... This was soooo chemistry filled... he was hotter than any of my crushes.
Why this pretty curly guy stared at me from behind at my face?
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