When he told his wife that, he didn't give me much details but he said she was basically offended. Never ask certain questions to your spouse if you don't want the answer
I feel sorry for his wife and for anyone you get involved with. The fact the both of you don't understand the subtext of this situation is not good. It's UTTERLY daft and emotionally stunted actually, given the context.
People sometimes ask these questions when they feel insecure, ignored or are trying to squeeze out affection from someone who doesn't meet their needs in that way. Sometimes they can sense something is wrong as it's their way to try and fix things.
What they want is comfort & reassurance, and if the answer is not as nice as they expected, they want something they can hopefully work on together, as a couple, because one person is unhappy.
Before getting married, he is been in several relationships and he always told me that he never cried over any girls and was always indifferent whenever his relationships would end and he always moved on very quickly and continue living his life as if nothing happened
It's clear that he was never in love with them, and might not be in love with his wife either, hence the total indifference.
Romantic love isn't some kind of 'yeah you're alright' type of thing. It's not merely liking someone, find them sexually attractive, or simply not minding they're there. It's also not valuing someone for how useful they are, or the services they provide.
Some men are with their partners because they quite like being 'looked after' and they want the sex. They regard women as a household appliance - quite useful, but not something you get heartbroken about, and you can always just replace them if you want another one. If they want companionship, they can get that from their male friends, which they regard as their equal.
Unfortunately, there seem to be many men in relationships that are just like that, where they think that's love. Some people genuinely can't tell the difference sadly.