Yes, NTR stands for both Netori and Netorare and I'm sure there are a few others I may be forgetting, but the core principle is the same, only difference is the point of view
But I think some would say that it's NTR if MC is romantically/sexually interested in someone, but someone else beats him to the prize, while I can understand why people would say that, to me it's just "MC liked someone, but didn't grow the balls in time to make his move and now he lost his chance"- kind of thing. But NTR's purpose is to cause jealousy and even anger in the player/viewer, even in the MC
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
If I recall right, NTR literally translates "Stolen from someone by sleeping with" or something like that, so how can it be NTR, how can something be stolen from you, if that something was never yours to begin with
But oh well, there are tons of different interpretations of NTR, different opinions.