I also feel the guilt of letting my AD down, but the only person I was feeling guilty for was me. I love him with all my heart and he could careless. My son will not talk to his father and has never reget it. I always told him it was not his fault for our mistakes. I am also a recovering addict but as for you. You are doing what you need to do for you and your child. If your father does not understand then it is his lose not yours. I am sure your father understands that you have to do what you have to do.
Stay one day at a time.