There is no love between them, of course this is his unilateral view.
It hurts to see him cry for others, and makes you jealous when you hear him say he loves others.
He had met so many people and experienced so many things, but it happened to him.
When two lonely people meet, get acquainted, and then live together, they are just each other's spiritual support. When did the daily "I love you" words become true?
Unknown attribute attack? ×Yandere brother is under control?