WRONG!!! No matter what they say You. Will. Not. Be. The. One. Who. Changes. Him!!! Only he can change him. But first he will have to admit there is a problem, which won't happen. He may go through the motions of "change" but rest assured it is only for show.
I've had to really work on this. I used to think that if I was kind to someone they would be naturally kind back and when they weren't it hurt. This mostly happened with girls that I wanted to be friends with...now I'm still nice, but super-picky with who I choose to let get that close.