Unconditional love: I love that person for who they are as a person and that they are in my life (or were in my life).
That doesn't mean that we stay in any type of abusive situation or dysfunction because of that love.
Unconditional love has nothing to do with codependence.
You can be codependent and be a manipulative, demanding person. You can be codependent and put all kinds of conditions emotionally on the other person.