Just let him know you care and often heroes stand alone. Many teachers unfortunately go into the field because they define themselves by the people that surround them. Peer pressure is hard to face and fighting against the tribal mindset can be lonely at times. However it's those that can stand up to others that can trust above the constant noise. I'm not sure if the best solution, but in a world where hero's are seldomly found all anyone can do is try their best to be that hero in the life of others.