It's not just her he's afraid of, is his own feelings aswell, also that he doesn't want her to find out his plan, and that he's afraid of the retaliation of divorce bc of her family getting to his head and i watched all the 'bad parts' and i don't think she's given him much reason to fear her?
she doesn't yell at him or hit him, she's just emotionally closed off most of the time.
She literally suspected him when things got better as soon as she was gonna die. He's not entirely 'afraid' as he is nervous, bc when she asked him to go to the hospital with her he snapped without a flinch.
So it's romantic and lovely that a grown man afraid of his wife and he do everything she asked and do more and shaking in front of her and stutter if he talks to her oh so cute and lovely π€π€π€π€π€―π€―π€―π€―π€―ββββββ they just make a perfect man literally in every aspect looks like this in front of a rock (emotionally) and tell us this is love and she loves him too , but if we reversed the roles and he do to her like this , i bet it will be a revenge thrills melodrama not romance comedy π€π π π