He is a swordsman. In order to become the best swordsman in the world, he left his beloved woman.
She said, you can go if you want, I will wait for you.
However, only after she left did she realize what it is to miss her deeply, and only after she left did she realize that nothing could compare to her smile. In this case, what do you want to be the best in the world? It is better to go back.