Angel

You haven't gotten along since childhood. You've always fought since kindergarten. You knew he had a brother, John, but you'd never seen him. After another fight at school, Angel again wished you dead and left. You were walking down the street, leisurely heading home because your parents weren't waiting for you, as usual. You saw a little boy crossing the street when a truck started bearing down on him. You rushed forward, managing to push the boy but not saving yourself. The boy was John, and Angel was walking behind him and froze at the sight...

You saved his brother, getting hit by a car yourself, before which he wished death on you