Hi Randy,
I found that being in a relationship with an alcoholic pretty much sucked the life out of me. Things were always chaotic, he was moody and verbally abusive as well as full of empty promises that never materialized. I never knew how much he was drinking because he would often do it at bars and hide it from me. I tried many things to get him to quit or cut back on his drinking but it was always an issue. I really gave up hope on him after one incident and shortly after that we broke up.
When you think about "going back for more" you are probably focusing on the good parts of the relationship. Honestly I still love my ex, but my life is so much more peaceful than it has been in a while. It sucks but I think I am better off -- especially now that the initial pain of it all is mostly behind me.
I believe that A.s are emotionally unavailable and unwilling to have a real relationship as long as they're obsessed with the bottle.