Yahiro eventually gives up his feelings for Akira, telling Tadashi that if he ever makes Akira cry, he will never forgive him, but knows that Tadashi would be better for her.
Yahiro eventually gives up his feelings for Akira. He will never forgive him. This is what Yahiro is telling Tadashi. He ever makes Akira cry. Tadashi would be better for her. This is what Yahiro knows.