At the moment, I suspect it's a visceral feeling that triggers cultural knowledge. My experience of being in love changed, as different cultures reprogrammed my emotions. Since we all can create culture, I reprogram myself too
For example, the redpill manosphere altered my notion of "being in love"
Also, I had personally reprogrammed my notion of "love". Which isn't the same as "being in love", but is related
The more I let my pre-programmed emotions run amok, the fewer conscious choices I make. A recipe for disaster. (Unless that cultural programming says "be conscious about it")
As I understand, cognitive scientist Lisa Barrett claims emotions are basically cultural knowledge + a word that's shorthand for it
Take the word German "schadenfreude": pleasure at someone else's misfortune. Normally, it's creepy for me to be happy at someone downfall. But if I say I feel schadenfreude, people smile understandingly & there's a cultural understanding about when it's appropriate & such