My ASD son made a best friend at work and he absolutely thought the world of him, he is 21 and was the only real friend he has ever had. His friend has now moved home to his own country and my son is devastated. I am really concerned about my sons mental health, I've tried to talk to him to get him to see a Dr but he refuses point blank, says he doesn't care about anything or himself, I am really at my wits end as he is an adult and I can't force him to go, I fear he is spiralling Into depression and I really don't know what to do. Any advice would be really helpful