Rampant literally means 'crawling' or 'creeping'. It's a vivid and somewhat dramatic verb that isn't typically found in everyday romantic song lyrics.
In this song, the narrator describes the protagonist's desperate hope: "Tu espères qu'un jour elle reviendra en rampant dans tes bras" (You hope that one day she will come back crawling into your arms). This powerful image of 'crawling' conveys a deep sense of longing and a desire for the other person to return in a state of humility or regret, making it a very memorable and emotionally charged word in the context of unrequited love.
Heartbreak can sound surprisingly catchy! In Elle Ne T'aime Pas ("She Doesn’t Love You"), La Femme slips on the black feathers of a messenger-raven to tell a smitten dreamer the blunt truth: the girl he adores has already moved on. While she’s pouring wine, perfecting her make-up, and blowing smoke rings into the night, our unlucky hero still clings to the spark he once offered her. The refrain "Ciao bella" rings out like a bittersweet farewell, reminding him that she now treats his devotion like a stranger’s lighter—use it, then walk away.
Beneath the song’s cool synths and whistle-like guitars lies a pep-talk for anyone nursing one-sided love. Stop replaying old memories, the raven croaks, and look beyond the windy plains of rejection; there are plenty of people who do dream of you. Forget the hate, follow your own path, and let her follow hers, because—sad but simple—elle ne t'aime pas.