Hmm...He sounds like the lonely type.
What type of person does he look up to?
Chances are, he's probably done some sick stuff and has some bad habits if he's attempted suicide. It snowballs. Do not say some bullcrap thing that channel one advertises.(Don't know if you have seen that - it's funded by Bill Clinton and some other liberals trying to control the school media.)
Try to figure out what he does when he is not around friends, what his hobbies are, etc., let him know he isn't alone that you are (white lies work) for him, hang out and just do normal stuff, because he probably think he is the 'Last Oddball on Earth.'
Active only during the Summer...