Well, you just cheated on her, she chose to forgive and stick with your character(because she is fucking devoted to you at this point and has to deal with it). Doesnt really matter if thats "how she was raised" statment is true or she chose to use it as coping mechanism. You can chose meanest options in other dialogues but she usually just goes "I will manage, we dont break up".
If that's true, that just makes me really sad for her. Like how far could this go? If we start beating her is she is going to just let us, accept that just how it is and forgive us? We can do whatever we want, without consequence? Has she no backbone at all? This is very disturbing when you really think about it.
Well, hitting her 3 times in a row eill get you -10 approval in game. As for other things, just remember "Shadowheart has faith in you"(from dark urge playthrough).