Please recommend a book about codependency that is not in regards to substance abuse
Most any book on codependency will mention substance abuse, if for no other reason than the concept began there. Treatment of codependency is about empowering the person who is the caregiver to stop that sort of behavior. The best book I can recommend (I'm a LMHC) is Codependent No More. I would also suggest looking at Attachment Theory, as some researchers believe it can encompass the problems ascribed to codependency in a wider-reaching theoretical approach. To that end you might read Attached.