If that was NTR, the girlfriend would have eaten the (R)estauraNTR food for the first time without her boyfriend, like on a lunch break or something, then she would have left him because the food was so good. Then the boyfriend would have come in to the (R)estauraNTR and also fell in love with the food. Then one day they would both end up at the (R)estauraNTR at the same time at the same section where the boyfriend could see her blissful look on the girlfriends face as she eats, knowing exactly how see feels, and feel absolute humiliation at not being able to cook such food for her. And she would feel shameful about being in bliss in front of her boyfriend over food that he couldn’t cook for her.
This is where it gets confusing, does he murder her food before she can finish it... by eating himself ( although a murder ending doesn’t necessarily happen for real) in order to get her to come back?