When he says 'I love you' how should i react?

my bestfriend and my crush actually are very close.The other day when i walked in cl EVERYONE was lookin at me.Then my friend came to me and my crush said don't say a word.In devotion my friend whispered he loves me .Everytime my crush comes to me i make a excuse to leave him.I like him alot but i don't know how he's going to tell me and how i am going to react.