Another Symptom of Codependency to qualify as codependent is Obsessions:

Codependents have a tendency to spend their time thinking about other people or relationships. This is caused by their dependency and anxieties and fears. They can also become obsessed when they think they’ve made or might make a “mistake”. Sometimes you can lapse into fantasy about how you’d like things to be or about someone you love as a way to avoid the pain of the present. This is one way to stay in denial, discussed below, but it keeps you from living your life.