I agree that you are lucky he called. My H hasn't wished me a Happy anything in at least 2 years and no Happy Birthday's in 3 years. Husband left the dy before my 50th birthday.
BTW, hope you had a very Happy Birthday, Hope!!
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.