Few people understand that true grief and grieving start after everything kinda settles in. When everyone starts to stop talking, when everyone seems to be continuing their lives. I was in your position. I lost my partner. You just have to admit that people bond differently and see bondings in their own way. Your loss is also their loss. Just at a different level. Nobody will be able to talk to you about your loss they way you want. People grief differently. Some need to speak out, some hold it in. Don't blame them for their reaction. Don't push yourself or anyone talking about their grief. Now you are too in, too suffering. You need your time to grief. For your specific case, when you want to grief, go talk with some of his friends. Tell the others that you want to talk about him cause you are missing him. Tell them that talking about is your way of grieving and respect the fact that some may not be able to open up the same way as you. He will always be there in your soul and mind. With opinions and laughs. In good and and in bad. Trust me on this: You will not forget him. Never.