Like just because someone changed and apologized doesnt mean they need to be together. Painful things will always be painful, in time we just deal with the pain better. I've seen people try to save their relationship for so called love and for the years spent together, but they never end well. Just like mc most people will try to reconcile as they werent the one in control of the breakup and thinks they can do something about it. People can forgive but not forget. When you accept them things will compile again, and you will spend another 10 years with the wrong person.
It shouldn't take a breakup to realize that you need to change as a partner. Love is when you put someones need/importance above yours. A relationship is a partnership with each others best interest in mind. A love without consideration is just infatuation. If this time he needs a breakup to realize, next time, what will it take??
Is this your first Korean BL? because I'm going to hold your hand when I say this
I think you are the one projecting here respectfully. You are assuming the anatomy of every relationship in this world is the same. What if they move on to other people and hurt them because they never got over their ex and pressured themselves that 'moving on' was the right thing to do? Human beings are not a monolith. If it doesn't work for you doesn't mean it can't work for others.
Sometimes i wonder if authors who write stories like this went through breakups where they were the ones in the wrong so they make the MC just like how they acted while in relationship but instead of breaking up like what really happens in reality, they would make them reconcile and justify the previous actions because power of love.