Ds2 (13) has lost his best friend and is very upset, his mum has up and gone, leaving the area suddenly, my dear son is very upset and I'm not sure what I can do for him, he wants to have contact with him, I think he wants to make sure he is alright, he was in tears when he realised he would not see him anymore, he didn't get a chance to say goodbye, so he has had no closure, your advice please.