Derretí is the past tense of the verb derretir, which literally means "to melt", like ice cream on a hot day. It's a fantastic and evocative word you don't hear every day.
In the song, Fonseca uses it metaphorically to express being completely overcome by emotion. He sings, "Con esa mirada yo me derretí" (With that look, I melted), perfectly capturing that powerful, heart-stopping moment of falling in love.
Por Toda La Vida is Fonseca’s open-hearted pledge of forever. In the verses he admits he is no everyday hero: he is still learning, sometimes confused, and certainly not invincible. What is unbreakable, though, is the “iron” love he feels. A single hug from his partner wipes away every worry, her morning kisses are a blessing, and her light fills his window like the sun.
The chorus turns that devotion into a joyful vow: “Voy a quererte, amor, toda la vida” — I will love you all my life. Gratitude, vulnerability, and passionate admiration dance over a bright vallenato-pop groove as Fonseca melts under her gaze and even drops her name, Mariana, in a tender shout-out. The message is clear and catchy: she can always count on him, every day, for the rest of their lives.