It seems like Kimihito is trying to grow. He wants to know fully that Takeru loves him for him and not their positions and tbh I don’t blame him. I think this is a good step for the both of them. He says at the end “now I gotta make Takeru want to be with me” so it’s not like he’s just gonna give up and move on. I think this could actually be really great for the story and Kimihito as a character. Idk that’s just me but this doesn’t seem as big of a misunderstanding to me and more of a step forward for Kimihito. Takeru hasn’t said anything either so I’m sure he’ll have his moment of growth too. This is just the start if it for the both of them
I think some people are misreading the seme fucking someone else. It wasn’t cheating, and it wasn’t in pursuit of making the uke jealous at all, he did as the uke said. it just so happened that he found out, it was also clear the seme didn’t want him to find out because he knew he’d be upset. It was a great opportunity for them to finally communicate which was done perfectly. This didn’t ruin it at all it made it much more realistic and stand out from most yaoi attempting to do this trope and do it shitty. This was great and I love this manga and author
Also I get if you’re upset about him sleeping with other people, but understand it wasn’t him cheating or intentionally being an asshole. Everyone’s entitled to that! I personally understand why he did what he did