We want best friends to share our feelings.a friend is one who cannot say anything  to us and  always ready to help us and also for doing some fun
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We want best friends for many reasons..cuz they are only ones whom we can tell all our secrets,stupidness,all the lame things,the ones who helps us in our every need,the ones whom we can trust,etc,etc.It is never possible to explain a best friend.
Hope it helps and pls mark it as the best answer.:-)