Friendship VS rumor, will you speak ill of he/her behind your friends?

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Friends are multiple, some one, you don't like he/her, but you have to be together with him/her, because of the predestination, you can't break up iwth those honest friends. But under unbearables situation, you can chose to talk about his/her with your good friends, tell about his right and wrong. Does friendship really be light as water? Friendsip VS rumor, will you speak ill of he/her behind your friends?