My REACTIONS to my loved one with alcohol problems and my loved one with an affair were very similiar and very codependent. I had more recovery under my belt with the affair though and it did help to work through it faster.
I don't consider myself an ACOA because neither of my parents drink. There was a lot of chaos though and I meet a lot of the criteria describing ACOA. For me I think this is a huge part of what I was working out in my relationship that included and affair and active drinking problems.