I am so sorry to hear of your struggles right now. You are in my prayers. I, too, have received much hope and insight into my situation from reading your posts. It seems as if your H is regretting his decision. I hope he is there for you when you really need him.
Know that we are here for you, too.
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.