" So, here is my definition of a codependent: A codependent person is one who has let another person’s behavior affect him or her, and who is obsessed with controlling that person’s behavior. The other person might be a child, an adult, a lover, a spouse, a brother, a sister, a grandparent, a parent, a client, or a best friend. He or she could be an alcoholic, a drug addict, a mentally or physically ill person, a normal person who occasionally has sad feelings, or one of the people mentioned earlier. But, the heart of the definition and recovery lies not in the other person—no matter how much we believe it does. It lies in ourselves, in the ways we have let other people’s behavior affect us and in the ways we try to affect them: the obsessing, the controlling, the obsessive “helping,” caretaking, low self-worth bordering on self-hatred, self-repression, abundance of anger and guilt, peculiar dependency on peculiar people, attraction to and tolerance for the bizarre, other-centeredness that results in abandonment of self, communication problems, intimacy problems, and an ongoing whirlwind trip through the five-stage grief process "

― Melody Beattie , Codependent No More: How to Stop Controlling Others and Start Caring for Yourself