Friends or foes?

What would you do if you discovered your best friend had made up a fake rumour about you? Of course, the rumour is a bad one.

Lets assume that its a rather hurting one. Something you never expected to come out of her mouth.

I sometimes wonder if the decision I made years ago was right. I chose to keep quiet and forget about it. Of coz that friend of mine does not know that I knew the story behind.

What would you do?