Facebook friends help?

[♡ Wishful thinking ♡]

So i changed to diff schools and i made new friends..but i also made a facebook account and alot of people from my previous school added me. So now i have contacts/friends from both schools, old and new.

But i told one of my friends from my current school about this guy that i liked at my old school. And that guy just recently sent me a friend request. I would def accept it, but i don't want my friend to know. She's going to post on his profile or pics and tell him that i used to like him. That would be so embarrassing for me!

Is there a way to prevent my friend from looking at my friends list and yet, still keep her as a friend on my list?

It's like she's always looking at my past friends and asking me about them. If she sees that guys name, i'm dead.
Help PLEASE!