My life, my dominion

I was just wondering on a very silly topic. How to reject someone.
And yes dun laugh i'm most definitely not referring to myself. no new offers of companionship as yet. :P
So yeah, how do you reject someone or is there any other way to react when someone confesses? i prefer gao bai, more qin qie.

So yes, close friend confesses, what to do?
How do you react?
Rejection? ANy soft way to shot an arrow through the heart?
Or do you accepted temporary unrequitted love? Can you? Should you?

Yeah we're twenty and this all sounds so tweenish but i mean everyone's gonna have to go through this at least once, so, let's have your say.

how?