Most Helpful Guy
Why do you think he would treat you the same after a break up? Break ups are normally very painful to at least one of the people involved. If he is in pain because of the breakup he may need to distance himself with you, so he doesn't get hurt even more.
He was so sweet and would always be there for you because he loved you. In order to go back to being what he was, he would need to fall in love with you again. If he can't be with you, then what you are wanting is for him to remain in love with you, as you refuse to love him in return. That would be incredibly painful for him, and very selfish of you. If you want to get back together then it might be possible to go back to how things were, but otherwise just leave him alone, and let him move on.
Most Helpful Girl
You can't change a person they have to want to change. Maybe in the future if he realizes what a mess of himself he has made, he might regret letting you go and come back to you. But for now I would just let him, don't chase him.