There are cognitive processes and limbic reactions associated with basic emotions. And you can change brain chemistry, but you're still not going to change memories and experiences in a human being.
Helen FisherThere's magic to love... Millions of years ago we evolved three basic drives: the sex love, romantic love, and attachment to a long-term partner. These circuits are deeply embedded in the human brian. They're going to survive as long as our species survive on what Shakespeare called, this "mortal coil."
Helen FisherRomantic love allows you to focus mating energy. Attachment sustains that relationship as long as necessary to raise your baby.
Helen Fisher