Yeah. Right now Ichimaru got on my bad side, too. At first I kinda felt for him, because the end of his friendship with Haruto was the reason of a misunderstanding. At that point Haruto was actually happy, that Ichimaru thought of him as a friend and just asked him about them really being friends to confirm it. But because of his straight and unmoved face, that he always got at that time (due to family circumstances, that Ichimaru didn't know about), Ichimaru felt hurt and was't able toget back at Harutos good side after that. Which is kinda sad.
But to put Izumi in a bad light, just to make Haruto more selfconcious and to mess up the relationship, that finally made him able to show his emotions AND on top of that kiss him, when he was already clearly confused enough, is something I can't forgive him for. SHAME ON YOU ICHIMARU.
Putting all obvious hate aside for Ichimaru, common sense tells you to NEVER kiss someone who is dating someone else. Not only is that rude AF, the nice guy is probably going to beat you into next week.
In all honesty if this is how they react in conflict, if they started to date it would be over as quickly as it started.