V is cheating in the sense that she is having sex and a relationship with someone without the person who she's married to (legally or culturally) knowing. She was forced into the marriage, and chances are he doesn't have any strong personal feelings for her, but that doesn't make it not cheating in the technical sense. Morally, I'd say it's not. She is in both the relationship and marriage against her will.
The restaurateur I don't find creepy, other than his appearance which is designed to be creepy. I feel that he's actually gay, and that's why he's getting off on watching his wife fuck us. He watching a guy have sex with someone. Assuming he is gay, and not bi with a strong preference for men, I do think he is faking his marriage. He might well love her, but I don't feel that he's IN LOVE with her. I don't think he deserves it, not in the malicious sense. He's neglectful of what his wife needs, probably because he's simply incapable of providing what she need not out of ill intent, he's not abusive. I do think both himself and his wife would be a lot happier with other people than they are together. I honestly have no bad feelings towards him really, like personally if they got divorced and he still wanted to watch, I'd be open to it. Like, he's actually a nice guy. Super creepy face but that's not his fault.