How long have you known your best friend?

My best friend has been around for almost ten years. We met in elementary school. We play together in primary school. In junior high school, we both loved reading, discussing content and arguing together. This is really an argument. We were both stubborn at that time. In high school, I wrote letters when I was not at school. Now I'm in college, not even in a city. Although I don't often contact, I won't be embarrassed when I contact, and I will chat together for a long time. I haven't seen this guy for six months. I miss her. Best of all, you know, she's always there for me. After all, she knows so much about my dark history, and I know so much about this beautiful little fairy now. I can't get rid of it. In my life, she basically sends letters. At that time, I went to the mailroom every week to find letters, and I couldn't be happier.