It's good writing, resentments can build even before we know it. Nothing he's done is forgivable, but their relationship isn't black and white. Life is so complicated. I just hope she gets her closure and can move on to finally find that shiny backbone that we all know she really has. Maybe even tell Mincheol to shove it. There is no recovering their relationship, it's far far too gone. She deserves the world.

They were just kids, they went through so much. I understand why she didn’t wanna leave him and his actions as well. He had an opportunity to be and do better but he didn’t want to leave her so he missed his chance. Most likely blames her for it, and so does his friend. Idk there’s so much to it.