diagnosis

my friend's brother was diagnosed with aspergers and i wanted to help him so i researched this to find what can be done and i looked at the symptoms and i am struggling to believe he has it because 1. he feels love 2. he was popular in school 3. he looks normal. So he must have maybe caught it later and started to regress mentally? Is there a cure for this disease because i couldn't find any on the internet. If there is a cure, please say because we are worried about him and we don't want him to go through life being anti social and end up a lonely old man. thanks