Seriously, I think of all people, Haru is probably the most forgiving person of all, regardless of how he acts. This especially shows in episode 10 where Haru overheard Sousuke and Rin’s conversation. Despite how Sousuke treated him in ep 2 and how he gave him the cold shoulder Haru still understood and told his teammates about Sousuke’s problem. He asked the team to try extra hard, so Sousuke could have the relay with Rin he has always dreamt of.
No saltiness. No bitterness because Haru hasn’t found his own dream yet. Haru was forgiving and showed solidarity and that’s one of Haru’s greatest qualities for me.