It may be a little fear, too. When I lost my mom, it brought into reality that I wouldn't have my father forever. I spend much more time with not because of his loniliness as my fear of his dying. I wanted to spend more time with him so I wouldn't regret it when he was gone. He died two years later and I'm glad for every minute I was able to spend with him. My mom has been dead 5years and I'm not over it yet. However I don't take it as far as you husband does. I don't go to her grave daily etc. Give him time.