I prolly read this story 3am in the morning so I didn't fully digest the story. Personally if I loved someone for so many years, and ended deciding to dating someone that I did not have genuine feelings for at the start and we started dating without sincerity. Then I would understand the MC's deep loneliness of longing someone you know you can't have. I know it sounds harsh but kiyoto is prolly just a filler in MC's life to make him feel happy, but despite that he's still lonely. So I just it was better for them to break up. Kiyoto also needs to build up before trying love on again.
I prolly read this story 3am in the morning so I didn't fully digest the story. Personally if I loved someone for so many years, and ended deciding to dating someone that I did not have genuine feelings for at the start and we started dating without sincerity. Then I would understand the MC's deep loneliness of longing someone you know you can't have. I know it sounds harsh but kiyoto is prolly just a filler in MC's life to make him feel happy, but despite that he's still lonely. So I just it was better for them to break up. Kiyoto also needs to build up before trying love on again.