Agreed. I also think the omega didnt settle or get broken. He made his choices and ended up with someone who loves and provides for him even when he treats them like a stranger. And jealousy should be sorted oit one way or another and orientation as well. Imagine being married with your same sex partner and they keep checking out the heterosexuals. I would feel unwanted too.
Understanding is not a justification. At what bothers me it's not that he feels that way, but that none of this characters are actually improving or growing.
To tell a story you need to show certain development and this author is not allowing this. They're stuck with their sick twisted and terrible way of doing things.
And there's stories that try to show the ugly face of humanity and it's ok in that kind of plot, but in here... it is shown as "oh, so cute" "haha they're fighting because they love each other", "they're just lovey dovey, that's why this guy is trying to trigger a thrauma in his husband". That's what makes it terrible.
And then young people read this and think that's how life work and think imitating this behaviors is ok because "it's love". Or permit their partners to treat them like that because "that must mean it's love".
It's toxic, that's what it is.
You can be a jelous person, no one can stop our feelings, but it's your actions what determine who you are. And this guy decided to be a freak.
Hyesung was broken. He at the end accepted what was "less bad", but it's not what He wanted for his life and no one respected what his feelings and goals were. At the end He had to accept the situation he was in but if you re-read the whole manwha from his point of view, He was pushed throughout the whole story. He hit rock bottom and clung to the only option He was given.
But ok, you can think their story was sad but now He is adapting and starting to live happy. Even finally receiving an option He desired: Go to school.
And what does this guy do? Interrogates his lover's friends to know if He's hanging around Alphas (Since here we are going in the wrong way. Come on, really the ONLY thing you care about his life at school, about what makes him happy, is to know if he has pretenders? It's like if Hyesung is an object that belongs to him, not an actual person). And after finding out that his lover could be mildly attracted (MAYBE, because it's not even stated; it could be a total different thing like being courius about them) decides to "teach them a lesson" to learn what? To not look at anybody ever again? To not have friends or interact with other people? Come on, it's just too much.
By the way I'm married to a same sex partner and I'm bisexual so my husband used to get really jelous of women (mostly because I had some flirty reputation before being with him) and He never pulled sh*t like this. He can feel insecure sometimes, but even in the worst scenario He would never do something this wrong.

I don't know why I keep reading (Is Byul, I know is Byul) but every time this author just give me goosebumps with how distorted their view of a relationship is. There's no growing here, just idiots going around in life.
"I'm gonna teach him a lesson" for god's sake, what the hell is wrong with you? How much do you want to brake the poor guy you say you love? He already settled with you, opened up, you literally have no problems with each other why are you going around making a problem out of nowhere?
And what if He feels attracted to omegas? it's not your job to "teach him a lesson", He is your lover, not your slave, damn it. This is sick as hell. Haven't you pushed him through enough thraumatic experiencies?