No. If you play the scene to completion and allow her to talk then you find out she wasn't cheating, although the choice to believe her or not is up to you. I give you the option to rage quit because that should be an option. Whether it's the right one or not is up to you. But, even if you decide she was cheating, it's not NTR. You aren't forced to watch a girl fuck another dude. If you want to change the definition of NTR, that's on you. Again, no NTR. End of story. I'm also not talking about NTR anymore.