bro dont do anything to him, act cool. coz if you start to snap all over the place and start to make a scene, then people will start to suspect you. by beating him up you will basically confirm that you are infact on gear and that he spilled the news. so dont. because if you werent on gear and he started telling everyone that you are, you wouldnt beat him up, you would just laugh at it. so do the same thing now, say that you actually take it as a compliment, since you are natty and he thinks youre on gear. trust me, just be cool. if a cop catches a suspect and the suspect starts to run, what are the people gonna automatically assume: Hes guilty. or else why would he run. well its the same thing here if you start to go crazy on him, people will see this and say "hes mad coz everyone knows that hes on steroids" also they;re gonna start with the whole "roid rage" bullshit, and before you know it, there will be rumors about you that never even happened. so act smart, be cool.