Reject her and tell her you consider her a good friend.
1. Pretend not to take it seriously.
Unless your best friend has been outright confessing her love for you over and over again, you can pretend it's not a big deal. Pretend that your best friend is joking, or that she's not awake and talking in her sleep. In the time you pretend to ignore this matter, you can also have time to think about this matter, but also let your girlfriends understand that you have some complex psychology, will also be appropriate to give you time to consider.
2, do not change the habit of interaction continue to come and go.
Don't change your dating habits after a sudden confession in your girlfriends, don't express a hint of your dissimilarity. Continue to be heartless and your girlfriends dating, the time to not pick up his phone continue to ignore him, the time to eat together continue to eat, just pretend that nothing happened.
3, they think about each other have no future.
If you have a boyfriend or husband, then be sure not to have any behavior that should not appear, continue to be friends on it. Never get emotional, this loss once you decide to be unchangeable, your wrong decision, you may even make you lose your friendship.
4, and BFF exchange once.
In fact, as long as the girlfriends confessed to you, this shows that the other side is "intentional" for a long time, not to drum up the courage is not and a close friend of their own confession of love. Even if you pretend to ignore this matter, even if you pretend nothing happened, in fact, the two hearts have some strange feelings inside.
So, when you still haven't made a decision, you may want to communicate with your girlfriends about love, of course, don't bring up the two of you personal "love", just to explore each other's breath.