Maybe I'm misinterpreting what you are saying, and if so I apologize. But it seems like you are upset that after choosing for Alexia submit to Andras and turn to him for emotional support over her husband at every turn for months of in game time, her relationship with Rowan has reach a point that you feel has become irreconcilable. But what did you expect to happen in that scenario?
But what makes you so certain there will be a forced reconciliation? Personally I fully believe that when the full story is done there will be multiple endings based on the player's choices, and in at least one of those ending Rowan and Alexia will no longer be together.
Even if there is a reconciliation it will probably a several scene long optional arc or you'll have the option to continue on the Andras sex slave path. If that is the case, if you find her actions utterly unforgivable the just don't choose to reconcile. But just because you would be utterly unwilling to forgive her doesn't mean that other player's feel the same. some players might just enjoy being cucks, some players might just have a very forgiving nature, some players might shrug and say Rowan cheated way more so it's a wash, some players my consider how little Rowan know about what she has done and decide that it would in character for him to forgive based on his limited information.