I picked this quote because I believe that Finny felt like this when he returned to Devon. When he found out Gene was going to leave him to go to war, Finny felt hurt. He felt he wasn't as important to Gene as he thought he was.
I miss the girl that made everyone happy and didn't self-harm, wasn't suicidal. I miss the girl that had tons of friends. I miss the girl that didn't need cheering up because she was always happy. I miss the girl who used to be me.