Your honesty and self-awareness is truly refreshing. Agree with Shezbut that you must put up some boundaries, to save yourself from giving too much of yourself away to him. And only you know what those boundaries might be. It might be helpful to make a list of your "limits"-what you will absolutely not do anymore for him-and then you don't have to weigh the decision each time you are faced with it. Unconditional love does not been accepting all of his behaviors. I think there are times when he has to face the music alone. Prison is a lonely place and I applaud you for sticking by him there; I know I would be doing exactly the same thing with a sibling of mine, whatever the cost. Be brave, be firm, find the right kind of love for your brother that will not drain you. Wishing you well with him.