Well, have everyone forgot that the first chapter were actually "in the future" where they are "newlyweds" so just because of this reason any sort of NTR will not ever happen and they actually do end up together.
However if I am completely wrong about this they do not end up together or something shit happens, my rating would go from 9/10 to 1/10. I would actually be affected negatively to the point of being suicidal. 🤡