Also, groups like these can help a codependent to work on painful issues in their own lives. Many join support groups with religious faith. Some are very helpful. Many who have a relationship with God receive even greater strength. Making changes to lifelong habits and patterns is hard.
Every relationship has problems and every person in a relationship hurts their partners.
That does not give the addicted person an excuse to start a bad habit or become addicted. The person with the addiction is the one who started the bad habit, and supplies himself with whatever he or she is addicted to. Codependents are only responsible for what they do. When there are things that they do that they know upset their partner and still do them, then they are responsible to try to understand and make changes. Regardless of our choices, we do not make them become addicts.