How many four years are there in a person's life? Have you ever regretted it during these four years? Regret leaving and letting him leave you. Every time you wake up and find that he is not around you, do you regret not being able to hug him? Looking at the couples on the street, do you want to be happy when he is by your side?
When you meet again four years later, the first thing you should do is hug him or say goodbye.
I will hug him and say long time no see