Sam,
Its good to hear from you. I really feel for you in your situation. My sitch is pretty straight forward, W doesn't want anything to do with me, no mixed signals, no false hope.
You walk such a fine line, between trying to get your H back and trying not to enable his addiction. Do you think this confuses him? Maybe I dont understand but on the weekend you will see him you say that you want him to see you as a person he has to have back in his life. Then you say your going to set some firm boundries and walk away from him. Looking at this from my perspective its confusing. What does your counselor say about this? I'm definetly no expert at what your going through, I just know how I would react. Or maybe your trying to make the statement "here I am, see what your missing, first kick the addiction then we can work on a relationship"?????

Anyway something to think about, Its good to hear from you.
Hope