In life there would be one friend with whom you can share everything,you should share with that person.
When i cosider some one friend, I never doubt him and share every thing with him but I find now that some of them are no real friends but pretenders.
That's true it happens in life sometimes we are not able to recognize people and trust them but later came to know it that person whom we trusted is not worth to trust. :)
Thats true, unless we are sure about the person it is better to be cautious about sharing personal information .One gets to hear many cases where the best and closest friend has been the cause of misery in one's life