Conversation: The conversation between human and AI assistant.
[|Human|] We have a family friend who lives in Japan whom we have known for many years we live in the us).  When we met, he seemed like a normal person.  He has an exceptional ability with numbers (being able to mentally calculate 6~7 digit numbers in seconds) which we found amazing.  But aside from that, we have been noticing that he severely lacks social skills; as he does not seem to have any friends. To give an example, he recently contacted my brother over the phone several times and by email; when he did not receive a response, he said that he is flying over to see us.  As in other instances, he is very persistent and  refuses/cannot have anyone drift away from him.
[|AI|]  Exceptional math skills !!That's wonderful. A few people are gifted. And a few people have the misery of lacking social skills. This need not be a mental issue per se. Try to keep him involved with people he understands and share the same interests. And just when the friendship is deep enough between them, try to disarm the social bomb making him aware of what boundaries are. Such people might get hurt pretty easily, so be sure you are polite and convey the message straight enough. Good Luck !