I feel like I have to point this out again (this isn't a call out or anything) that this Ruve of the present and the Ruve of her other life are basically different people. If a me in an alternate reality murdered someone, but the me in this current reality didn't kill that person, should I apologise? We are different entities. Obviously that does not mean Tia is obligated to get over her trauma or forgive that Ruve, but it also means that this Ruve, in the end, didn't do those hateful things and shouldn't be held accountable.
Therefore it makes absolute sense that he and Tia can be together, since the ultimate lesson of this story is that a person's circumstances and life can be changed with just a simple kind words. That fate is not fixed, and the you in the now is worth more than anything else. By ending up with Ruve, the female lead heals and accepts these facts.
I feel like I have to point this out again (this isn't a call out or anything) that this Ruve of the present and the Ruve of her other life are basically different people. If a me in an alternate reality murdered someone, but the me in this current reality didn't kill that person, should I apologise? We are different entities. Obviously that does not mean Tia is obligated to get over her trauma or forgive that Ruve, but it also means that this Ruve, in the end, didn't do those hateful things and shouldn't be held accountable.
Therefore it makes absolute sense that he and Tia can be together, since the ultimate lesson of this story is that a person's circumstances and life can be changed with just a simple kind words. That fate is not fixed, and the you in the now is worth more than anything else. By ending up with Ruve, the female lead heals and accepts these facts.