Échappatoire translates to "escape" or "loophole". It's a less common word than a simple "fuite" (flight/escape) and carries a nuance of finding a way out of a difficult situation, often implying a clever or indirect method.
In the song, the singer questions if she is merely an "échappatoire" for her partner when he needs a thrill, suggesting she's just a temporary solution or a way for him to avoid his real problems. This word highlights the emotional depth and the singer's feeling of being used.
Nej's "Mon Enfer" is a really honest look at a relationship where one person is giving everything and the other isn't. She sings, "Je suis restée, J'ai bien voulu croire en toi" [I stayed, I really wanted to believe in you], showing how much she's invested. But even when they're close, she feels distant: "Même dans tes bras, j'suis loin de toi" [Even in your arms, I'm far from you]. It's clear she feels like a temporary escape for him, "un moment d'évasion" [a moment of escape], while he was everything to her, "les murs de ma maison" [the walls of my home].
She's wrestling with whether to keep fighting for this connection, asking, "Pourquoi devrais-je me battre?" [Why should I fight?]. There's a powerful sense of not even knowing the person she's with anymore: "C'est comme si, Comme si je te connaissais pas" [It's as if, As if I didn't know you]. The title line, "Tu pourrais devenir mon enfer" [You could become my hell], really hits hard, showing her fear that this love could turn into something truly painful. She feels unheard, saying, "Ma parole, c'est de l'or, et la tienne fait du tort" [My word is gold, and yours does harm], and ultimately, she'd rather cry alone than beg for his attention.