My 15 year old sons friendship group for past 3 weeks have excluded him from all their group chats, ignoring him at school and at at local football team who they all belong to. He doesn’t know why and has asked but he’s gone from being this bright and bubbly boy to this sad lonely one all the time. He doesn’t want to go to school as he’s no one to hang round with and feels awkward. I’m also so upset by it all as it’s heart breaking to watch the change in him and feel helpless to do anything. He doesn’t want me to talk to any parents for fear of making things worse I’m at a complete loss how to help.