Most Helpful Guy
Not sure where you are from, but guys almost never get compliments. Some girls even think I'm good looking for some reason and I've almost never been complimented. I'm guessing that he figured you were just being polite because he complimented you.
I've noticed that women who are way older compliment but it seems girls around dating age almost never do. I figure it's because girls will often do anything not to show they may like you, especially when they do.
Many a guy has moved on from a girl just because she doesn't want to show she likes him, and well, loses him.