If your friend is still on drugs, no matter how well you used to be friends you need to distance yourself from him. Until he gets better, he will only hurt you. The drugs you described are pretty bad and if he has previous experience, he was addicted long before he started using drugs before. I have alot of experience dealing with people who are addicted and was once myself an addict, this will only get worse before it gets better. Try not to feel hurt, your friend isn't the same person anymore. If and when he gets better you can go back to being an active part of his life , until then you should remember that he doesn't care about anything but getting high. good luck