I've had this friend for almost 15 years and consider him family and would do anything for him and his kids. Out of the clear blue he has decided not to talk to me or acknowledge me when we see each other. Numerous times I have reached out to him for an answer but got nothing in return. We're both in our 40s and I value what friends I have and this is bothersome. Should I reach out to him one more time and ask what is going on and try to make things like they used to be?