okay...its not as bad as you may think.fair enough,this may of freaked you out a bit when it hapenned...but really,are you atill freaked about it?
did he pinch you on the behind as he told you your cute?or grab your crotch when he said it??? NO.....so he's not going to crack onto you unless you show him that your interested! some of my male friends are gay,i dont mind,its there choice,but i know when they crack onto guy.cause they seriously grab him and feel him up as they talk to him! if they just want to compliment him,they will walk up to him and do it,,but without touching. dont stress....as someone alrady said,if a gay guy says your cute,take it as a compliment.....they are brytally honest people!! just smile,say thanks,and if you are really worried,just politely say to him" thanks mate...you know i'm straight though right?" he will take this a a rejection,but a nice one,so he wont get hurt,or pissed off,and you wont be embarissed.

oh and.....just because someone has a different sexual preferance to you,it doesnt mean you have to treat them like an animal!!!
