Why does a guy keep staring at a girl?

jessicorn
It might seem as a really stupid question, but lately with my friends we've noticed that this or that guy keeps looking at us (not only one day). And we were just wondering... Why?
Do they think we're pretty? Or interested in us?

What does a guy think when he keeps looking at a girl in class (not only one day, but for many days)?
Why does a guy keep staring at a girl?
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