Resignarme comes from the verb resignar, meaning "to resign oneself" or "to accept one's fate." It conveys a sense of reluctant acceptance or giving in to an unavoidable situation.
In "Solo Amantes," the singer uses this word to express the painful realization that he must accept the terms of their relationship – that they were only ever meant to be lovers. Despite his growing feelings, he has to resign himself to the fact that she doesn't love him back, making it a poignant and relatable word for anyone who has experienced unrequited love.
Edwin Luna y La Trakalosa de Monterrey open with a breakup lie — "No creas que no me importas" ("Don't think that I don't care") — before admitting it isn't true. The singer has been drowning his sorrow in bars for over a week: "Llevo más de ocho días bebiendo por ti, ahogado, llorando en cantinas sin parar de sufrir" ("I've been drinking for you for more than eight days, drowned, crying in canteens without stopping suffering"). What started as a no-strings arrangement — "El trato fue ser sólo amantes" ("The deal was to be just lovers") — turned into feelings he can't walk back, leaving him stuck with a deal he now regrets: "Y tengo que resignarme" ("and I have to resign myself").