I have experienced various sad and happy memories. Each of them taught me a lesson for life. I would like to tell everyone about a sad memory but it gave me a lesson in life, and it made me more mature. It happened 2 years ago, when the friendship of me and my best friend gradually faded. Because of some reasons, she couldn't learn in the same school with me and she moved to the city. I always thought that our friendship would not change but, one day, in my birthday, she didn't turn up. I thought that she had been busy so she couldn't come.But, suddenly,I saw on Facebook , she spent time with her new friends and there is no message from her sent to me. From that moment, I realized that nothing is permanent, even Friendship. Friendship can be ruind no matter how long it is. It made me sad a lot but it was also a new lesson for me.