I need HELP!!!

Ok the reason that i'm posting this is because i really need some advice on what to do. well see i'm a senior and theres this stuff thats been going on with me and this sophomore. well this thing that happened, has happend twice, and i told my three closest friends... and i know that they would never tell anyone. well almost my whole school knows about it now, and i know none of my friends told anyone.... which makes me think that he told a bunch of people. he's on the football team, so the whole team knows. everyone still talks about it and it happened over a month ago. i love this guy more than he will ever know. but he's mad because he thinks that i went and told everyone, but i know for a fact that he told some people, so i don't understand why he could be so mad. we're not even talking at all, and i see him all the time, and have class with him. the worst part is that he has a girlfriend.... the same one for over a year. and see i wanna piss him off so i think i'm gonna date his bestfriend, cause he wants to date me. but i'm really not sure.