My guess is that he felt too guilty to face him. He felt underserving of even being in his presence when realizing the weight of his actions and how awful he treated him over multiple misunderstandings. However, I think it’s ridiculous that he was shocked by the eventual outcome of Sejin’s suicide when they were bonded and he knew he felt miserable. He was probably too caught up in his own guilt to really think about what Sejin may have been experiencing and thought it better to just completely be out of his life, since he didn’t deserve to even face him. He might’ve also been scared of that eventual confrontation, having to see the way Sejin looked at him in fear and disgust when he still loved him would’ve been gut wrenching, so maybe he was also running away from the consequences to only realize after the fact that he ended up having made an even bigger mistake when Sejin killed himself.
You are totally right, I read chapter 94 of the novel and that’s pretty much what he says. But yes the reasoning is pretty pathetic.
Finally Sejin diva asking the right questions. I’ve been wondering this and asking in the comments for so longggg. If anyone knows the novel chapter pls let me know. Why did he leave sejin to rot for so long ultimately resulting in him killing himself. Like what was he expecting to happen. And how did Ido end his own life?