Well if you had him while he was addicted to drugs you probably never did know the real guy. Thing is he may have been attached to you for reasons related to being still dependent on drugs. Now that he feels more independent due to his freedom from drugs, he may not feel the same way he thought he felt before.

You should never depend on anyone so completely that when they are gone, you are lost. it is not a good place to be and I'll be honest, I know how that feels. I've been there before and I feel for you, only having it experienced it enough that i know better now.

I know that it hurts to be broken up with.

He is unable to give you what you need. Close that door.

You say you cannot stop hoping. I think you've mistaken hope for "want" because hope is just that, actually hoping for something, and it doesn't typically bind us in teh way this has done to you. You wish and want for something that truthfully sounds like will never be.