"Well you have a pretty shitty idea of what a good relationship should be, then," he retorted.

"And you've been a shitty girlfriend! Cheating on me, treating me like shit... God! Yeah, I have the right to know why you wanted to go out with me when you treated me like that!"

So now his negative feelings toward Eli were coming to a head. Everything he disliked about the relationship were things he tried to ignore before in convincing himself, "Hey someone likes me enough to want to be with me!" But it was stupid. He knew so little about her.

People who are truly compatible should be open with one another. He thought of Yu-senpai and what he had learned by being his friend. It was because they were open with each other that Kanji was able to better himself, was able to accept himself... And Yu accepted him. As did the rest of the Investigation Team.

So this whole situation just made him angrier, realizing what he subjected himself to by dating Eli.