When he said "i know what i did was wrong" what did he meant by that??

i think he was referring to touching miu (or however you spell it) in a sexual way when he was in a relationship with someone else its all one big misunderstanding though since im pretty sure that miu and kenji are not dating and the seme is just jumping to conclusions ┗( T﹏T )┛

Shit, then is he still in a relationship?

I don’t think any of them are I’m pretty sure they’re all single