At times it can feel difficult to understand the distinction between being codependent and being supportive. Codependency thrives where there is a serious lack of autonomy. Any sense of autonomy within a codependent dynamic will often be met with anger and rejection because it threatens the dynamic.
Emotional support does not depend on anything. It is being supportive, sympathetic and caring without making it about yourself. Some people may need more emotional support but as long as you do not need them to need you it is not codependent. In theory the two are fairly easy to differentiate between however in reality it is more difficult and the lines can become blurred.
What may have started out as emotional support can turn into something codependent if both people allow this to happen.