I didn't know that I had few real friends until I graduated. When we were at school, each of us had many friends to play with. You can go shopping at ordinary times, and there are many endless topics to make up lessons together. We consider them all our friends. But only after graduation will I find that there are very few real friends around me. Those people who usually chat with us are just people who have the same topic in high school. They are not our real friends, so everyone has a tacit understanding that they will not contact each other after graduation and will not disturb each other's lives. The older you get, the less you like to disturb others, because you don't know what kind of person you are in the other person's mind. If we often disturb others, we will feel that this way is wrong, so we are all habitually silent. Since everyone has remained silent on the chat software, they will not meet privately.
Second, I have started a new life, and the same topic is gone. Everyone lives a similar life at school and the circle of friends around them is the same, so there are always endless topics to talk about. But after graduation, we will face a new circle, in which all kinds of people are completely different from the previous circle, so it is difficult for us to share our lives with others. After graduation, there are fewer and fewer topics for everyone, so there is no reason to contact again. Slowly, two people changed from friends to passers-by and strangers.
After graduation, our responsibilities are getting bigger and bigger, and each of us is constantly running for our own lives. After graduation, there are fewer and fewer holidays every year. During the holidays, we want to spend more time with our parents, so the chances of meeting each other are getting less and less.