You sir are a genius. This is exactly what the author intended for the readers to get but which they sadly don't. They're too fixated on the cheating that they fail to see the real picture. Those two were destined to be together no matter what, even before they met!! That is what we see unfold in the story.
So what if that’s the author intention? That still doesn’t make the cheating and gaslighting from the mc ok?
There’s plenty of omegaverse stories where the ml/mc resisted temptation from their “fated one” or pheromones from other alpha/omega other than their love interest.
Why are you defending jaehee’s actions?

I feel like Jaehee has always been attracted to the professor. In the first chapters he literally said he loved the smell of the beta but it was actually the omegas pheromones on him. He was never going to be able to resist the omega. Lol I actually like the story.... the beta found a better partner & the alpha&omega are together. I actually feel bad for the omega, he didn't have a childhood but why should he have to kill his child? That's what an abortion is. He was just too young to know how to balance both...