perhaps you haven't heard of the frog in the pot explanation yet? put the frog in the pot and he will stay in there and boil to death coz he does not notice the gradual change in the heat. one of the best explanations of how codependence gets you.
i find it very hard to think that a non codependent could live with and alcoholic or actually, vice versa- it would be impossible for an alcoholic to live with a non codependent person because a normal person would not put up with someone who regularly poisons themselves on purpose.
can be like a setup when we are young and hopeful that we would not live out the behaviors we grew up with, but then without any other better examples to live by we do and end up playing the game.....just like the frog in the pot.