Because in a relationship you should try to communicate with your partner not just believe whatever you want and make decisions based on that. I mean he didn’t even try to explain to him what bothers him and just left him after 8 years. Plus, not everyone expresses love the same way and he didn’t try for even a sec to see things from his lover’s point of view. Don t get me wrong, I m not saying that he should’ve stayed in a relationship that made him miserable or anything like this, but his way of dealing with everything was extremely selfish, especially that it was towards a man that was by his side for so long...
Im kind of annoyed at why people are annoyed at Jeonghan (white haired uke) for leaving the boyfriend. Im sure a person would feel lonely and unloved if a person didn't show them they're love at all, it would get tiring and this story shows well how relationships in real life can be.