I get a little giddy thinking about all the cute ways people call each other ‘lover’ around the world. In French you’ll often hear 'mon amour' (my love), or the playful 'mon/ma chéri·e' depending on gender; 'mon cœur' (my heart) is also tender. Spanish has lots of flavors: 'mi amor', 'mi vida' (my life), 'mi cielo' (my sky), and the soft 'cariño' or 'cariñito' for something extra sweet. Italian leans romantic with 'amore mio', 'tesoro' (treasure), and 'cucciolo' (puppy) when someone’s feeling cheeky.
I like to spot patterns — many Romance languages use words that literally mean 'love' or 'treasure', while Germanic tongues go for 'treasure' too: German 'Schatz' and Dutch 'schat' or 'liefje' are classics. Slavic options include Russian 'моя любовь' (moya lyubov - my love), 'дорогой/дорогая' (dorogoy/dorogaya - dear), and Polish 'kochanie'.