What is a friendship mean to you?

I think friendship is such a big issue right now in everyones life specially those around me. All my friends have been experiencing a lost of a really great friendship at one time, including me. It's sad when you lose a good friend or a friend you thought was good. People can be whoever they want but I think when it comes to that point where you don't have that same level of emotion, then it's done. I feel that a friend should grow with you, learn with you, go through rough times with you, share happy times with you and respect you. I believe that, that's how I've been to my friends. If not, then I would really like to know what I've done wrong so I can make it right.