Se rehúsa means "it refuses" or "it resists." It's a less common verb than simply saying "no quiere" (it doesn't want), adding a touch of poetic resistance.
In the song, the singer uses it to describe how his heart "se rehúsa siempre a dejar de amarte" (always refuses to stop loving you), personifying his heart's stubborn inability to move on. This makes the word particularly evocative and memorable.
Have you ever tried to get over someone, but your heart just won't cooperate? Lucah's "Se Supone" is all about that struggle! The song starts with the singer reaching out to an ex, asking "¿Dónde estás?, ¿Cómo te ha ido?" [Where are you? How have you been?]. It's clear they're still stuck in the past, admitting "Las fotos que tenía contigo Siguen estando en el mismo lugar" [The photos I had with you Are still in the same place].
Even after months, they can't forget, blaming their heart because "Se rehúsa siempre a dejar de amarte" [It always refuses to stop loving you]. The title, "Se Supone" [It's supposed to], highlights all the things they should be doing: not dreaming of kisses, not thinking their ex will return, and moving on because "alguien ya está en mi lugar" [someone is already in my place]. But despite all the supposed progress, the truth is, "Como ves fue mentira Y te quiero todavía" [As you can see, it was a lie And I still love you]. It's a relatable anthem for anyone whose heart has its own stubborn plans!