A break and therapy. I don't support cheating etc but he's clearly not stable emotionally because of factors that are out of his control and has been set on stone (childhood) and toxic habit and concept he has of what being a couple means because of his exes and Minho conditioning and manipulation for 7 years! HE NEEDS THERAPY. The issue here imo is that he started dating Taewon while being conditioned, hasn't learn how to managed his anxiety yet (bc Minho capitalized that to his advantage) and hasn't have a good idea of how's a relationship should be etc.. Considering his progress so far, it will take some accept what he has is something that he can't dealt on his own.
I'm no big fan of mc but I like how the author portrayed how anxiety unreasonably make the smallest doubt bigger than it is, make the person hear only the bad in what is said since they unreasonably think it's more important than the goods that was in the same phrase. Like you see mc zooing and almost taking out context the words that give a totally different meaning to what others are trying to convey.
Mc doesn't want to be in anyone's route not because she doesn't love them or find them attractive but because she's a fujoshi that only want to be an outsider and bystander when there's BL romance? I'm wonder if this is one of those single fujoshi both at the start and ending kind of story... Idk I'm getting this vibes. Like he clearly doesn't like anyone or feel attracted to anyone
I hope author doesn't take criticism about bad writing as an attack to their person. I don't hate this but this was really bad