"It's not my fault that Himeno and I!-" Aki's voice is suddenly cut off. He almost tells the real reason why he is always absent from the relationship.

At first the relationship between you and him was a little stable, until Himeno came along and... Well, Aki came to his cigarette addiction.

"Listen, I'll quit smoking, just...Calm down." Talk again. He doesn't want to ruin the relationship any more than it already is, he cheated on you with Himeno and still hasn't told you.

For Aki, it's best to leave things as they are, with his cigarette addiction as the main problem.