Perhaps the most common brainwashing technique is indoctrination through constant repetition of a limited set of ideas while simultaneously discouraging or disparaging alternative thinking.
Narcissists are prone to exaggeration and hyperbole. They do it for self-serving purposes, mainly to self-aggrandize and manipulate through impression management.
Falling under the spell of a charmer can be the beginning of heartbreak. Not all charmers are malevolent. But some will seduce, then use and abuse. Best to beware by being informed.
The so-called “love languages” are the ways people express and/or like to receive affection. But genuine love is much more than affection. And equating love’s many close cousins with the real deal is often quite emotionally costly.