Friendship VS rumor,will you speak ill of him or her behind your friends?

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Friends are multiple,some one,you don't like him or her,but you have to be together with him or her,because of the predestination,you can't break u with those honest friends.But under unbearable situation,you can choose to talk about him or her with your goog friends,tell about his right and wrong. Does friendship really be light as water?Friendship VS rumor,will you speak ill if him or her behind your friends?