It wasn't because he got all the attention.
It wasn't because everyone always said that he'd be the 'Great One'.
It wasn't because he got the better the broom.
It wasn't because he had a way with people that I would never have.
It wasn't because he used to tell everyone I was a squib.
It wasn't because he always got to choose what games we played.
It wasn't because he broke my remembrall.
It wasn't because he could make 'them' stop arguing with a cheeky grin.
It wasn't because he never said thank you when I took the blame.
It wasn't because he became a Gryffindor.
It was because he called James Potter the 'brother he always wanted'.
It was because he laughed knowingly when I became a Slytherin.
It was because he assumed, but never asked where my values lay.
It was because he started viewing me as the enemy, before I ever was.
It was because he promised things wouldn't change when he left that September.
It was because the station wasn't the only thing left behind that day.
It was because he never asked me to go with him.