FFS. Can ya'll finally learn what NTR really is. If the chick gets sexually assaulted and then violated by the guy (insertion) and then enjoys it and ditches her lover (husband, boyfriend, crush, etc) for the rapist, THAT is NTR. NTR ONLY occurs if someone is sexually stimulated by someone other than the person they are in love with to the point they crave that stimulation. If your lady friend goes off and is unfaithful without having been assaulted first, that is cuckolding. If it's just a dream, that is a big nothing burger. NTR holds no meaning as a term if its just thrown around like a temper tantrum for something you don't like.
For someone ranting about NTR you don't seem to fully understand what it is either.
NTR is literally cuckolding. They are pretty much the same thing in practice (only difference is that in the Japanese term NTR the consent of the protagonist is taken into account whereas in English the word cuckolding encompasses both consenting and non-consenting protagonists)
NTR also does not require sexual assault (though it
does require sex, something a lot of people forget), the girl can willingly consent to being taken, in which case it counts as not only NTR but also cheating. So long as the protagonist did not consent to the partner being taken it's NTR (if the protagonist did consent it's called NTS or Netorase btw)
Also if the girl is just a crush, by definition it cannot be NTR, as NTR requires two characters to be romantically involved in order for one of them to be taken by someone else. If the girl just chose to be with someone else instead of the protagonist from the get go that's not NTR. The Japanese have the term BSS for this specific scenario.
TL;DR Yeah this is not NTR because 1) There was no sex and NTR requires sex to even exist (that's what the N stands for, literally) and 2) because the MCs aren't in a relationship so she can't even be taken from him, it would only be a case of BSS if it did happen.