Kagura Hikaru was honest.
He wanted to break up with her.
Originally, he had intended to wait until after the election to come clean to Suse, as that would maximize his benefit.
But now that she was willing to help him, it would be too much to continue using Suse like this.
Not that anything he did wouldn't feel a bit like repaying kindness with ingratitude.
The current situation of the election had become quite clear, with Ayakoji Chiyoko's side projected to be at least on par with Hina, therefore the chances of winning the election were very high.
Plus, Suse had promised to help Hina, and that promise wasn't an empty one.
Her friendship with Hina, as well as her guilt, were genuine.
So, she would do it.
Even if she had already broken up with him.
"...How could this happen, breaking up.....?" Kohinata Suse was shocked and then stepped back, "Kagura, what... what are you saying...?"