They probably will, but that doesn’t change the fact that it’s there. I really can’t stand stuff like that, and when it’s in a story, it instantly kills any interest I have.
I didn’t like that part either (and I wasn’t going for her to begin with, so less of an NTR for me), but it is kinda plausible since it is stated that you have been away.
It doesn’t even seem plausible to me. In their last interaction, she said she wouldn’t even be interested in him if he was the last guy in Ireland. Them ending up together makes zero sense.
It’s supposed to not make sense. All of the friends are shown to be deeply damaged by what they experienced that day in Glenkildove, each in their own way. Kitty in particular feels guilty because the last thing she did before Simon died was storm off in an uncharacteristically selfish snit. It’s not hard to see Donnchadh, after his cousin went missing, taking advantage of her compassionate nature to insert himself into her life at a time when her actual friends were starting to drift away. Under ordinary circumstances she would likely have matured into a compassionate and assertive woman, but the trauma entrenched her deeper into the pattern of self-abnegation, and on some level I’m sure she was eternally trying to atone for that moment of selfishness by devoting herself to a man who would hold her to it.
It’s fine to not like it, even if I agree with @AletheiaKnights but that’s not NTR. You didn’t have anything defined with Kitty before you moved away. It’s unfair on both of you to wait 9 years for anything to happen.