Looking at colleagues who have entered the company one after another, what poems can express this feeling?

I paid attention to you that day because I thought you were leaving. This suddenly made me feel very sad. There are so many people in the world who have never met before, but I met you. In my life, so many people come and go, some are good friends, some are just acquaintances, and too many are just encounters. Friends and strangers are just coincidences, and no one can play an eternal role in your life. Strangers may become friends one day, come and go. I thought you were leaving. I thought I couldn't keep the lost years, just as I couldn't keep you. Time can't keep me, but you have no reason to keep me. I am used to your going back and forth, so if you want to leave my world, there will be no going back and forth. You have your world, and your appearance is just a coincidence in my world. At that moment, I felt that in such a big world, there are many worlds like you and me, only some people's.