Co-dependency is a slow killer. It kills both the dependent and the one being depended on. The former is being conditioned to think he will not survive without the latter. The latter will be forever guilty or afraid that something bad might happen to the former if he leaves and whatever that is, he is to take the blame or is made accountable. This is not a healthy way to live. It's typically just like stockholm syndrome. I think it's only right that each try to give themselves at least a day or two in a week away from each other so they can live normal lives.
Your favorite song is not always the one also liked by many. If you are a singer, there are songs you like to sing and there are those you only like to listen to. If it's the same song, then maybe you are lucky. If it's not then it's perfectly fine. I am sure you can create different versions of it. I don't know why I can't seem to have a peaceful day without listening to some song I like at least once a day. Music can really heal you if you listen to it at the right time and right place. Choose yours wisely, I may say.