I don't want to scare you, but it sounds s if he may be back into drugs or something more. Methanphedmines are well known in my area, and disassocation and sudden intrest in other things/lack of important things are things to look out for. I would sugest when you can get in contact with your friend that you talk to them and let them know how you are feeling and that they can tell you if they need help. Be there is the best thing you can do, but be careful and be supportive. Do research and get facts...PM me if you have any questions or if this doesn't make sence.

Dar