Consumait comes from the verb "consumer," meaning "to consume." While it can mean to eat or use up, in this song, it carries a more intense, metaphorical meaning.
The lyrics state, "Comme si on se consumait dans notre propre feu" (As if we were consuming ourselves in our own fire). This vividly portrays a destructive, self-inflicted emotional burning, making it a powerful and memorable word to describe the toxic relationship in the song.
"Qui tu es ?" is Willy William asking the question at the heart of a relationship built on lies: who are you, really?
The singer describes a love that ran on deception from the start — lying became routine, almost a game, until neither partner could tell truth from mask anymore. He confesses to hiding his own feelings behind a metaphorical helmet, wearing a different face for the one he loves than the one he shows everyone else.
By the chorus, all that dishonesty leaves him unable to trust what he sees: is she a mask or the truth? A friend, a lover, or neither? The song never answers — it just keeps circling back to the same demand: tell me who you are.