Blizzard, I don't know if you remember but I'm originally from Buffalo too and kind of feel a kinship. Please don't be so hard on yourself. Addicts are masters at telling us what we want to hear. It's almost a sixth sense they have. I truly and honestly know exactly how you feel. Don't look at it as a humiliation - you believed and cared for someone and that's the part that matters. The truth is that you are a kind and caring person who worked very hard to help someone. The end result doesn't make the caring and kindness you have shown worth any less.
Being mad isn't always such a bad thing. It's helped me several times to really see the truth of my situation.