He does this first of all by making them smarter, which is not insignificant, but also by making them realise that love does not exist, that it is just an invention of our brains in response to our own existential frustration and fear of abandonment, that the person we think we are in love with is nothing like who they are really, that we desire them because they elude us and that once we have them, we cannot remember what made us desire them, and that anyway, we are irredeemably alone, so in love, either we suffer terribly or we become bored to death.
