The one thing about the first three scenes is Hutch was very close to Vivian. She wasn't discreet. She didn't stop when he was around. He was there in flesh and he physically tried to stop her without success
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and before the backyard scene happened there was no hint of their relationship was not good. And even it were a façade Vivian maintained the modest perfect wife act for Hutch for 22 years. So at-least I think for Hutch it doesn't make any sense. He could've burst through the bedroom doors but then what? She went willingly with him knowing fully well what he is capable of while shutting down her husband, let him lock the door. She isn't feeling guilty for her sleeping around with Christian otherwise she would have stopped it. She is feeling guilty/remorseful cause her action is making pain for Hutch but mainly cause he isn't OK with her for sleeping around. She always want to HEAR HIM SAY IT that whatever she is doing is the right thing. Even when he opened the relationship he was so vogue. So what's eating her away is she can't go to him and say
"I need to hear you say it" and Hutch would say
"Yes honey you're doing the right thing sleeping around"
I get your point and mostly agree with you. But like her he is discovering/knowing her true self. He didn't know she had met him before in the morning office. So to him she dropped the pant to a total stranger just after meeting him for few minutes. Running away isn't an option, divorce doesn't make sense to him (however the dynamic was in their marriage it never hinted that it was bad). So other than let the bird fly and hope she would come back cause he don't know she was a slut before or slut at heart. He thinks she is a modest wife who was seduced/blackmailed. But the bird choose to fly far away to meet up with a snake and get eaten by it.
For once I agree and understand your point.
yeah and she asked the question after confirming she is going, after she took tremendous amount of time & effort to get ready and even put a vulgar dress without bating an eye.
And their marriage dynamic showed that it's always her to makes the decision not him. He is not my favorite MC but till now I can't also hate him for his passiveness. Though I think ch3 may reveal something about him that will make us hate him at-least close to Vivian and Christian. I think that's why "My GF is a Blue collar worker" is one of my favorite VN where each character gets their fair share of consequences.