Netorare always relates to the protagonist. If Anna was being cheated on, and she got jealous, or someone else she had strong feelings for, had sex with someone else and that made her jealous, then it would be netorare. But Andrew is not the protagonist, and therefore what happens to him cannot be netorare.
The only plausible instance of netorare in this game, is with John, because Anna is jealous of his sexual friendship with Janine. I never said it definitely wasn't netorare. Just that Anna's relationship with John isn't that strong. They're not in love with each other, so the mental anguish that typically the protagonist feels with netorare, isn't really there. In Japanese, netorare means ' to be taken away'. So really the protagonist has to believe his/ her love interest is being stolen away or at least might be. Does Anna feel that with John in this instance? And the answer is no, she's not worried about that in the slightest. The real reason for her jealousy, is that she hates not being the focus of attention. So if it is netorare, I think it's a weak version of it.
Technically, you could say several events in this game are instances of netorare ( others include Rebecca with King at the Gym, and flirting with Alfred during the gardening scene, and even Andrew flirting with Hannah at the restaurant.). But the emotional impact on Anna for all of them is so weak, that they barely cross the threshold of what truly constitutes netorare, and that's why I think it's debatable, to say it's in this game.