wait.. you cursed at him, then called him another curse word, and then claim "we're friends"? I don't think I'd be too sure of that If I were told what you told him. Personally I'd just apologize. I don't think it really matters what he did at school to tick you off, you probably shouldn't have gone onto facebook and cussed at him like that. Plus if you apologize I doubt he'll tell any sort of authority.