My Cinderella story

So there's this tottaly cute guy and I have had a crush on him since 4eva and he just asked me out. Problem? There's this chic that has the biggest crush on him and she is my ex best friend. She said that if I say yes to this guy she will spill my biggest secret all over fb and the school! I'm desperate to be his gf but if i say yes then my biggest, most embarrassing secret will go everywhere! Help!