I hate to satisfy the desire for popcorn, but honestly, I'm really tired of this kind of legalistic wrangling to make something "technically not NTR" but still intended to provoke jealousy. That's why the tag is defined the way it is. The "netorare" tag here on F95 includes many things that are technically negorare, but it also includes a lot of things that
aren't technically netorare. It's also why we can never count on the absence of the tag to actually mean anything. I shouldn't have to keep repeating this, since anyone who reads
the tag definitions can see it for themselves:
If the character is a
romantic interest, and they are (romantically or sexually)
involved with someone other than the MC with the designed narrative intent
to cause jealousy, it qualifies for the tag. Period. It doesn't matter if it doesn't meet the technical definition of the word "netorare". If a person has a problem with that, they should take it up with staff who make and maintain the tag definitions, not people who don't want to see other dudes' dicks in their LIs to try to make them jealous (whether technically in a relationship or not).
As for this game specifically, while I enjoy BadMustard's other game, the comment about "it's not NTR if they have broken up they do get back together" makes me extremely wary of exactly this kind of attempted legalistic sidestep, and it makes me suspect that, even if it may not NTR by the word's definition, the story could very well match the definition of the F95 tag I posted above. So, definitely not playing this one until it's done or we find out for certain if I'm right.