I think the guy will be back to acting like he is your friend, especially if you are the type of good friend who shares the prize even if he didn't ante up. If he is a real friend then he will realize he was acting out of a drug induced paranoia and apologize for his rash words. Most anyone using ice knows it can cause undesirable effects upon the mental state, even if you think you are immune you see it in others and therefore must be prepared for the side effects yourself. What I'm getting at is that he should realize that you unintentionally left the "empty" bag and that shit happens when high. I can totally understand how someone might make the mistake of leaving an empty box of Cracker Jacks with no prize inside. I can also see how someone might think that they got intentionally screwed in the moment of disappointment. In hindsight, it should be apparent to a friend of several years that a mistake was made. It should also be equally apparent that there was over-reaction to the mistake. Friends should be willing to see what happened was the basic side effects of the dope.
On a side note. Years ago a friend left me a note that said he "left some good shit" in the downstairs bathroom. when I got there I only saw that he had left the toilet seat up and the biggest turd I have ever seen. Damn thing was clogging the hole and breaching the water's surface, it was enormous! I was angry at first until I saw the baggie on the sink, then I laughed. Had he just left the turd....it might have been a different kind of laugh.
I'm betting you guys have worked this minor friendship glitch out already, if not, communicate or at least make the effort. Best of luck!