I will say this. I think a lot of addicts feel deep, deep shame at what they are doing to their loved ones. Perhaps it depends on where they are at in their addiction. I don't know. But I think that many people definitely have moments where they think, "What the f. have I done."
Of course, then it just makes them use more. It's a vicious cycle. I was talking to my boyfriend one day and I said that sometimes I felt like his using was my fault and he got a truly baffled look on his face. "Why ever would you think that?" He could see the situation clearer than me. Good Lord.