The worst mistake I ever made was to lie to my parents. I have betrayed my parents just a few times, but it was enough to overcome as a person. Their confidence it's everything to me. Maybe I can't express it as I'd like. Let me try to explain it.
Confidence it's another value I've learned in my life. As I said, people will tell you the deepest secrets you'd never imagine. You have to listen. Listen selflessly.
Like in friendship:
Sometimes you will lose your mind , sometimes your friends will drive you crazy. But no matter what happends because a true friend should be there, with you when you really need him. And of course, this is mutual. In the best friendships must have confidence and loyalty. Always.
Once someone said me: "It is not easy to be a good friend. The friendship must be cultivated in every single moment my dear. So, take your time to be a true friend, because it is what really worth"
Since that day, I try to be a better friend and fortunately I have not betrayed someone's confidence anymore.

“A friend is someone you can be alone with and have nothing to do and not to be able to think anything to say and be comfortable in the silence”-Sheryl Condie