You’re thinking of the inference as “I don’t feel affection when I see her face → She’s not my wife”. Whereas, another way to think about it is “Her face looks like [insert description of wife’s face here] → She’s not my wife”.
You’re thinking of the inference as “I don’t feel affection when I see her face → She’s not my wife”. Whereas, another way to think about it is “Her face looks like [insert description of wife’s face here] → She’s not my wife”.