I never considered myself co-dependent--there were things that attracted me to my lovable "bad boys" but when it started really getting to me, I was on the verge of leaving the first one when he finally got sober, and I did leave the second one when he went back to drinking. That doesn't mean I didn't display some behaviors labeled as "co-dependent" at various times while I was with them, but it wasn't my normal self.
Smarie, it seems to me that maybe you're just holding onto this guy because he wants/"needs" you, and he's not likely to leave you because, after all, who else would have him?