So boyos here I was sitting in the outer area of my college which has benches , so I just sit beside a girl (just coincidentally) and she turns out to be quite pretty. There were these three occasions where both the our eyes were wandering and met and she smiled.This happened 3 times . However 2 girls were sitting opposite of me, so I didn't open. I didn't want to make her feel awkward/make a fool of myself.She just left with her book (I was assuming she'd stick around till the two girls opposite of her left if she was interested)Was she smiling just to be polite or what? Or did I miss one?

Edit:lol she's in the library sitting alone So I assume this is a red flag now , that she left even though she wasn't doing a thing.