Guys tend to bottle up their feelings. The best thing you can do for him is tell him that if he wants to talk that you'll listen to him, but don't nag him. He might not want to talk right away and so do something to take his mind off it. Go to the movies, a sporting event, a concert, anything to help him take his mind off of it, then when he decides that he is ready to talk, just listen to him and don't give him advice unless he asks you for it. Don't tell him what he could have done better or anything like that, instead focus on the positive aspects and give him a shoulder to cry on.