Wiki description of co-dependent behaviour
People who are codependent often take on the role as a martyr; they constantly put others’ needs before their own and in doing so forget to take care of themselves. This creates a sense that they are “needed”; they cannot stand the thought of being alone and no one needing them. Codependent people are constantly in search of acceptance. When it comes to arguments, codependent people also tend to set themselves up as the “victim”. When they do stand up for themselves, they feel guilty.