baffle day...

HELP ME!!!
got a facebook's friend want me to be his girlfriend...
please...teach me how?
i just bluff him i already got a boyfriend...
but he still want...even say don't let my boyfriend know it...
OMG!how?
i don't like him...he is only my friend...
and his age elder than me 6 years!
i have no courage to tell him that i don't like him...
i scare will hurt him...
why i always like that oneT.T...this is the second time...
somebody can help me?!?!?
please...
in the beginning...
i thought he was kidding...
how i know?
he say he is serious...I'm so scare after he say this to me...
i scare if i refuse him...he will hate me or not my friend already...
I'm so cowardice...