What else could you do? One of the mind boggling things about addicts is their total unappreciative attitude for any thing you do for them. They expect more and more, and what ever you do is never enough!
And, we can't feel like we are not doing enough! We do TOO MUCH.
One day when they are sitting on the street curb they'll begin to realize that if they want to live a "normal" life, they will have to change their attitude.
Its true too, that you do have a huge weight lifted off your shoulders when you're not taking care of an addict.