I gave up, I was tired, I left.
He finally knew that he spent his entire youth loving him, but in the end, he didn't get even a trace of his love back.
After he left, he realized that the person he loved was the real person, but there was no room for turning around. It would be impossible for him to atone for his sins in his entire life, just as the person who loved him deeply would not be able to impress the person he loved in his entire life.
In the end, the ignorant beast who was lucky enough to survive spent the rest of his life loving the person who once loved him deeply.
Intention: Please cherish and love everyone around you.