Heh, I thought as much.
You actually don't need to be personally acquainted with a girl in order to fall in love with her, you basically have to like her looks and how she acts with her friends.
That's all you need to feel the heartache.
There was this girl in my high school class that made me feel weird in these sorts of ways.
She was very silent and just a tad arrogant, but not much at all.
That, combined with her cute looks and fragile body (fragile as in being slender and petite), made me feel attracted to her in a very special kind of way; it's kinda hard to put into words, really, but I'm sure you can tell what I mean.
The thing that hurt so much was the fact that I thought she actually liked me at first, but then grew tired of me because of my acting unsecure back then.
And then I had to see her in school everyday, acting in her cute, silent and petite way.
Meh.