Have you spoken to him about a relationship counsellor??? Perhaps that would help and they would be able to talk further about the addiction and see if he is using this as a distraction for avoiding facing the burden of the school situation??

Just as I have learnt recently there are two sides to every story and lack of information through lack of communication can result in behaviour that we don't understand and result in changed/altered behaviour and problems within relationships.

Try and talk to him and encourage him to go see a counsellor/therapist x