I am glad to hear that he is not coming straight back to your house. It also sounds like you have a good plan in place as to what you will do so that you can complete your education and take care of your daughter.
In terms of recovery from codependency, it is a process. It's not like you wake up one day and everything is fixed. This website and the books I've read have helped me with my interactions with the people in my life (including the addicts and recovering addicts). It has helped me learn about things like acceptance, forgiveness, boundaries, and letting go.
It is a tool that I use. There are other tools that I use to help me in my life--including the support of my psychiatrist, regular exercise, eating regular meals, and balancing my work/school responsibilities.