i agree with all the things you pointed out but lets not forget it’s their both first mlm relationship. daehan is constantly surrounded by men on a campus and while it wasnt a problem in his previous relationship with women IT IS a huge problem right now
I agree on most points but although Daehan has been communicative this whole relationship, you can't just drop being communicative when you need it the most. He simply stopped listening to what Jinwoo was saying bc in his mind he'll say the same things as his exes. And even now he is projecting his exes on Jinwoo saying "taking a break" is just Jinwoo taking some time and then he'll call saying they should breakup. Jinwoo said they should take sometime to process their feeling and talk again which is what you should do when both partners are strung up and emotions are running high. But Daehan attitude shows that he has given up on the relationship. So, I will fault Daehan more than I will Jinwoo.
Daehan has a history of being uncommunicative with his partners and when things got rough he fell back into that pattern. He'll never have a good relationship unless he works that out imo.
Daehan has been consistently communicative and honest about his feelings throughout their entire relationship. Let's not forget Daehan confessed FIRST, and was turned down by Jinwoo. At this point, for Jinwoo to question Daehan's intentions and loyalty is ridiculous. There has never been true cause to believe Daehan would act unfaithfully, or that he truly prioritizes others. Meanwhile, Jinwoo needs to take ownership of his jealousy and truly say when he's bothered; instead of bottling things up until it becomes resentment. If they do break up, which I feel is coming, I hope Jinwoo does the chasing for once. A relationship requires two people to contribute, yet so far Daehan's put in the majority of the work. （￣へ￣）