My mate is bad on heroin and is really not looking good. But he told me he avoids everyone because he doesnt want people to see him like this. It could be that as well.
When hes ready hopefully he will come round. Ive read a book on 1 guy who was a coke addict for 24 year and is 11 year clean now.. and he lost everything. Some people have to really hit rock bottom or lose someone to realise. Hope your ok anyway.