One: Everyone went to different cities.
In college, we got together from all over the world and became good friends in a few days. But after graduation four years later, we went to different cities. Some people stayed in the local area, some people chose to go back to their hometown, and some people chose to work hard in big cities. Everyone was not together, and their feelings gradually faded. Because the feelings needed to be maintained, the relationship that they had not met for a long time naturally faded.
Two: Everyone has his own life.
In college, everyone's heart is still the same, at least they all study and play at the same starting line, but after graduation, everyone has their own lives. Some people start internships, while others choose to continue their studies and move towards higher institutions. Everyone started their own lives, and slowly it seems that there is no topic, and we will never talk as far as before. The circles are different, and it seems that we can't talk together.
Three: I am busy every day.
The world of adults seems to be very busy, and no one is leisurely, because after graduation, we understand the pressure of social survival. If you don't run hard, then you will be eliminated by this society. So everyone is working hard. Everyone is busy. They have no time to chat or shop. Every day after work, they just want to go back to their nest and be alone.
People who used to be together are also drifting away. Maybe this is growth.