must say that you are doing great for your husband and your relationship. Co dependency is related to having focus not on self but on someone else - on his/her needs, emotions, problems and all other "important" issues. It is very tricky situation and not so visible and it doesn't happen overnight but rather during some time. It is great that you are feeling strong, have some healthy habits an so on -that is really good. Additionally please take care to feel yourself, what do you feel deep inside, have you been connected to inner self, what are your current issues/interests that are not related to your partner's problems and his current issues, are there any? Being in your own body is nice explanation for having focus on self. We all are easily lost if our partners have some serious issues and we in that process need to take care of ourselves as well, it sounds easy when saying but hard to regularly do it.