Should i tell her the secret...?

ok so theres three ppl: me(girl) my friend(girl) and my other friend(boy) and shes one of my best friends and hes probabky my best guy friend. and i just found out that HE LIKES HERRRR! ahhhh!:D i always overreact to this stuff:) anyways ive been thinking about it on and off for a couple hours and ill c her tom but should i tell her? idk i feel like im betraying him but idk i wanna b able to talk to me qbout it i cnt just tlk about it to him hed get so annoyed and i kinda believe she has a right to kno