I wouldn't recommend saying that to your H, it sounds like something a mother would say and that is not what you want to be in his life...the disapproving mother. When my H left he didn't see our S17, who was 15 at that time, for nearly 6 weeks. He didn't talk to either of the boys for at least 2 weeks. I felt as if he was too ashamed and it made him feel guilty to see them.
Try acting the way you would if he was just a good friend of the family. Maybe you could do what Snodderly suggested to MrsH. She suggested that she make up a little Easter basket for her children to give to H. Is that something that you might have done if you were still together. You have to be the person that he would feel comfortable turning to when this all falls apart for him.
I know how hard this is, I am afraid I wasn't very good at doing this either, but now I am paying the price as H doesn't even speak to me. We have another D hearing on Wednesday. H filed in January of 2006 and we still are not D. Not sure how much longer this will go on. I am just praying that H will wake up soon.
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.