Originally Posted by
escape artist 
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.
That's just normal human behaviour. When things change gradually people don't notice it, or prefer to not consciously acknowledge what is happening and instead allow their subconscious to convince them that it'll all work out. Otherwise every single smoker and person with unhealthy eating habits is co-dependant. And looking at a more extreme example, most people who were western-world adults in the 1930's fits the frog description. Millions of Jews, known trade-unionists, Jehovah's Witnesses, Romani and known homosexuals continued living in Nazi controlled countries despite the ongoing infringements on their freedoms.
This is because people are extremely, extremely adaptable, it's the main reason for our success as a species. It allows us to get on with living in a fairly extreme range of living conditions. When changes happen bit by bit, we take them in our stride and this can occasionally be our downfall as well as one of our greatest assets. Because it lets people accept things they shouldn't have to because when things change for the worse gradually it tends to be initially easier to just accept them than to take a stand and call a halt.
So no OP, I wouldn't for one second assume someone was any more "co-dependant" than everyone else in the world just because they live with an alcoholic.