Yeah it's eventually mentioned in the novel, the entirety of his childhod was filled with learning abt emotions that he gained the ability to swiftly know what ppl are. But he doesn't actually get why ppl feel those emotions, he js uses it to make ppl have a good impression on him.
Lol it's not miller's fault that he's hot and he can enamour women. You might have to do a lil bit of self reflection why you keep getting rejected