I think i missed or just dont remember several chapters back abt him having a curse. I thought he can see at night haha. This explain why he doesnt recognize her as the woman he slept with
Respect turn to obsession. And he misinterpret it as love probably.
There are some cases in real life too, when you respect someone, moreover if that person age is not that far apart, it can turn into romantic feeling.
Thats why , communication. ML should learn how to communicate properly with the wife. Actually i am surprised he can even successfull in business with that level of communication.