Teenage girls are cruel to each other. There's a good book about this called Odd Girl Out: The Hidden Cult of Aggression in Girls. Don't assume it's no big deal and girls are idiots if they're hurt by this. I remember how things were in high school, even though it's been a long long time, and there were times that were hurtful and awful because of this need of girls to have constant drama and conflict. There are things that still hurt now when I think of them, and it's been almost 20 years since I graduated. And, while I wasn't in the popular crowd, I was fairly popular. I wasn't even among the girls who were seriously picked on, and it still hurt.

Here's some info from Amazon on that book http://www.amazon.com/exec/obidos/tg...glance&s=books