I don't think you were being a doormat. You were doing what was best for all concerned. Don't second guess yourself. If it was a friend of your H isn't this what you would do.
Everything happens for a reason, maybe Dad needs to find that it isn't better out there, he needs to realize how good he had it here. Maybe he will find God and that is the most important thing when he finds Him he will know he is supposed to come home.
