I don't take offense from a difference in preference so no worries. Her not becoming the NTR character's girl is possible but this game (as you may suspect by my name) only focuses on NTR/Corruption. So, even though you can get her to get her shit together and force him out, it will instantly pop you into a happy ending scene with her and her husband and the game ends.
Viewing post in Life After Victory (v0.13) comments
Well maybe if she is too far gone can you give the hero a happy ending ntr is questionable but the one who suffered is never given a good ending so if she's gonna lose to her desire atleast think about having the hero find out and him moving on and getting his happy ending with a truly loyal girl till the end
Honestly man, I would recommend STRONGLY that you do not play this game. The hero will get "happy endings" but other than the vanilla game-ending ones, they will consist of him being happy with the situation he finds himself in (in various ways that I'm sure most vanilla enjoyers would not be interested in)