Friendship Trouble?

I just don't really know who is my friends. Does friends lies? I just don't get why people lie, just to be someone else. Like for example, one of my friend in school who is so call my good friend who just can't say the truth. I know that truth can be hurtful but you have to tell because it is important to someone. Sometimes he or she will admitted it but continue doing it. No matter how i convince my friend he will still tell lies. This lie can really hurt a friend. This does not only happen to me but also to some of my closer friends. I hope you think about it......'friend'.