S.D.
My daughter had the same thing happen to her when she was 15. To her it was the end of the world so I respected that. Just remind him that you are his greatest cheerleader no matter what and that you are there for him when he is ready to talk. My daughter did and still handles things by staying away from everyone and just works it out in her head. I have learned not to intrude when she is in process mode and somehow she manages to make sense of it all. Just stand by with a hug an kind words. He has to find his way of making sense of it in his own mind. Do watch out for him though, emotions can get the best of them. Hugs for you, stay strong for his sake. <3