I'd say the issue isn't so much about what happened but more the fact that Eunhan lied to him with a straight face their entire relationship and never intended to tell him the truth. He was never scared of hurting Hangyul as much as he was scared of hurting himself. The two things mainly on my mind are 1) putting some distance between yourself and the person who hurt you this bad is genuinely a good decision, whether it's to calm down or cut off the relationship, and 2) when the entire foundation of your relationship has been a lie, moreover one that ruined your life even if you moved on... How are you supposed to trust anything coming out of that person's mouth?
In the past, Eunhan was just an asshole, but now he's also someone who genuinely can't be trusted. If this was real life, this is grounds to ghost (no joke intended) and never look back.
I really like this story but this latest chapter just rubbed me the wrong way. Based on the way MC has acted you would THINK that he would stick around to get answers like he did in the past but he just left. Didn’t he already say he was over what happened before and decided to move on with his life now? Not thinking about his accident or his life being “ruined”? His reaction only sets up a chasing arc and Im so tired of those.