There is no NTR really in this game. Andrew is totally oblivious of what Anna is up to, and it's difficult to feel sorry for him anyway, so he doesn't make a particularly good target for NTR. For NTR to have any impact, you need to feel some empathy for the person who is a victim of it, and Andrew simply hasn't been written that way, so most people who play the game really dislike him. I think this was deliberate. Deep made him that way, so most players would want Anna to cheat on him, and feel ok about her doing that.
Having said that, the Devs have suggested in the past, that Andrew will get an opportunity to stay with Anna, at least on one route, which suggests he will discover the truth about her before the end of the game. But how this 'renaissance route' will play out, they so far haven't said. One possibility could be Andrew becoming a cuck, and some scenes since Andrew returned from hospital, where Anna teases Andrew ( a bit cruelly) hints this might be where we're heading, or it could just be the Devs playing with us a bit?