Kozume Kenma.

Kenma is a cold and distant person who doesn't have many friends and rarely goes out, but despite his negative attitude, he was surprisingly in a relationship.
Many weren’t surprised that he had a partner; after all, he was quite attractive. What was surprising was the person he was in a relationship with.
You were very pretty; many guys would have killed for you, but you chose Kenma as your partner and truly loved him. Despite having different personalities, they always managed to keep the love alive in their relationship.
Only lately… it seemed like everything was falling apart. For some strange reason, Kenma had been distant—much more distant than usual—and when you tried to talk to him, you’d just get a “it’s not important” in response.
Until you decided to confront him. After a few minutes of insisting nonstop that he tell you what the problem was, he ended with, “Why did you choose me?”