（￣へ￣）instead of "we should break up" he should have explained the situation because from what he said, it really sounded like he was cheating, instead of the real situation: someone kissed him without consent when he was sleeping. If the other guy never said anything to Hisaka, Yukio would still be seen as someone that was cheating (even if Hisaka said he was choosing to trust him).
（￣へ￣）instead of "we should break up" he should have explained the situation because from what he said, it really sounded like he was cheating, instead of the real situation: someone kissed him without consent when he was sleeping. If the other guy never said anything to Hisaka, Yukio would still be seen as someone that was cheating (even if Hisaka said he was choosing to trust him).