Guys, why would you be staring at a girl's butt as she walks in front of you?

Anonymous
Me and my crush were in a deserted corridor in our college and I was getting out of a classroom after talking to a friend and well I walked a little away from the classroom but I suddenly remembered that I forgot to tell my friend something so I turned around to go back to the classroom and I saw my crush just standing there a few feet behind me just staring at me blankly.

We had intense eye contact for a few seconds. I guess then he got shy and looked down and broke the eye contact and well I got shy too and I went back to the classroom and he went to his classroom.

So why was he just standing there behind me, watching me walk? Was he checking me out or something?
Guys, why would you be staring at a girl's butt as she walks in front of you?
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