Tony is the MC... in all games the player can control only the MC
Anne cannot be controlled by the player...
making Anne faithful is not part of the original story
The story of Anne and Tony is about a couple who have been together since their college years until they get married as soon as they graduate. This couple has been together for over 15 years and got married 5 years ago.
It is assumed that they must revive mutual sexual interest to continue the relationship otherwise their divorce will be inevitable
here is how Anne and Tony was looking at the college times
View attachment 2392913
The fact that you choosing the route without Martin is not that by doing this she will be faithful to Tony
you can play as you want but the storyline is about a cuckold
you can only choose to do not know the reason why the MC is CUCKOLD... but this he is in any case by this way in all routes!