Thats why some people chose to have a few friends in their lives, some just chose to be cold and already stop seeking friendship. Because nowadays, a true friends is hard to find now.
I feel sorry for your niece friends, but I hope the boy is okay now. And as for his friends, maybe they are not a close friend or something. Or maybe they already reach out to the boy and just decided to have fun or something. But whatever the case, O hope that this boy has someone with him now who will comfort him in that hard times.
Friends are rare...not everyone can be called as friends....so we must preserve them what we have the best with us.