I moved away and she's really upset? Help!?

That's kind of silly. It's not your fault and you're not a jerk. You haven't done anything wrong. It seems like she's just over exaggerating. To get attention maybe? But you really did not do anything wrong. Even if she does like you, it wouldn't of made a difference if you stayed, because you don't like her in that way. It would of been a different case if she was your girlfriend or you were hanging out all the time or what not. Try keeping in contact with her. Have you heard from her that she likes you? You might want to talk to her, sort things out. Good luck :P