Their decision might have been based on certain aspects that he might have possesed that you didn't. By this I mean, he might have had more training in a certain area, more schooling, better fit (in their mind) for handling the responsibilities that would come with the promotion.
I agree with sexymama, go to your superiors (after you've calmed down) and respectfully inquire as to why he got the promotion over you and what you could do next time a promotion is up to improve your chances. It shows initiative, ability do effectively communicate, and desire to improve. Good luck!
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