Tbf, even if it weren't for the plot, i can understand why he wouldn't want Taebum to know about what happened. He most likely feels ashamed and also fearful of how Taebum will react, and fear does a lot of things.
While i do agree that communication is important and that he simply should tell Taebum, but his feelings are still valid none the less.
Yeah, I hate a miscommunication arc but this is one of those cases where you can't really be completely mad cause SA victims often will avoid or completely withhold that experience to keep relations safe and "normal". It's such a realistic depiction that I'm getting kinda nauseous from these chapters ;w;
i know that him not explaining the situation to taebum is for the plot, but i really wish he would just communicate
kind of annoying