Have you ever loved someone heartbreakingly?
Have you ever hated someone so helplessly?
He's just not you, so he doesn't understand you. He is not a scumbag or heartless, but because he is not you, he does not understand you.
Have you ever loved someone helplessly?
Have you ever hated someone with all your heart?
He just happens not to be you, so he doesn't understand you. He is not a scumbag or heartless, it is just because he happened to choose someone other than you.
Before that person left, he gave that person all his love.
After that Ren left, he gave all his hatred to that person.
No one can fill it up, how do you know?
But after walking by, you suddenly realize that he just happens not to be you.