Maybe I'm not understanding something about romantic relationships but I don't see why you need to exit it to re-evaluate it. I also don't see why you can't have an actual conversation about it before going to such drastic measures. Friendships are the only type of relationship I'm inclined toward, and I would want my friend to talk to me first and get my side of the story rather than deciding that I'm too friendly with other people and that we should stop being friends for a while. Like it would be one thing if there had been some kind of longstanding breakdown in communication but this came out of left field entirely
jinwoo mentions what he means by implying he needs a break multiple times. it can sometimes be more difficult to parse through your emotions with the subject/“trigger” present. this also only causes conflict because of daehan’s past, otherwise daehan would have heard jinwoo’s entire sentence (you can go back and check btwn chapters where daehan’s pov shows him essentially going into a panicked state bc of “break” while jinwoo’s sentence explained he needed time to sort shit out.) i agree that they have shaky communication but it is much more realistic for college aged adults to have speed bumps like this because interpersonal relationships do not come with a guidebook. they are simply figuring shit out as they go.
the author is also clearly working up to fleshing out & remedying both of their focal issues as individual characters (which the translator mentioned and explained well imo.) within this current arc.

This is completely and utterly 100% Do Jinwoo's fault :)