What should I do if I want to let go of someone and I can't?

find something to do and keep yourself busy.

think carefully, why can't you let go of that person? In the final analysis, it's because you have put all your energy and time on that person, so that your life is completely occupied by him. When he no longer loves you and leaves you without hesitation, you will feel that your world is empty. If you want to let him go, the best way is to find time for yourself to do it, so that you can get busy and enrich yourself, so that you have no time and energy to think about him again. For example, you can go to see some valuable books and movies, chat with some friends, work hard and so on. As long as you make yourself busy and full, then you can easily put him down.