Guys she declined his offer because she didn't want to hurt him , if he calls her nuna she...

Guys she declined his offer because she didn't want to hurt him , if he calls her nuna she will always mistake him for yuni , and in the future of it we're to be revealed to him , he'll come to the conclusion that it's not him that she loves but yuni and that he is nothing but replacement for him + she is protecting her mental health as well , she obviously has trauma from losing her brother and she doesn't want to live it again specially since Caleb is the carbon copy of yuni