Diría means "would say" or "would tell." It's the conditional form of the verb decir (to say/to tell).
In the song, the phrase "Quién lo diría" (Who would have thought it?) is a central theme, expressing surprise and disbelief at unexpected turns in life and love. It perfectly captures the song's reflective and somewhat astonished tone about finding love again.
Have you ever felt like you were just done with love? Vanesa Martín totally gets it in "Quién Lo Diría" [Who Would've Thought It]. She starts by saying she didn't even dream of love because she couldn't imagine "La dimensión de lo que me venía" [The dimension of what was coming to me]. She even broke off all ties with her heart, convincing herself she was "un veneno cargado de hielo" [a poison loaded with ice]. But then, something shifts!
Suddenly, everything starts falling into place, and she wonders, "¿Será que navegar nunca fue imposible?" [Could it be that navigating was never impossible?]. The chorus is so powerful, repeating "Quién lo diría, quién lo diría" [Who would've thought it, who would've thought it] as if she's amazed by her own transformation. She even says, "Se abrió la tierra y la locura se hizo guía" [The earth opened up and madness became a guide] – what a dramatic image for falling in love! The most beautiful line might be, "Si te digo que vi salir a tu alma por la mía?" [What if I tell you I saw your soul come out through mine?]. It's such a poetic way to describe feeling completely connected to someone. This song is all about rediscovering the joy and even the madness of love after thinking you were immune to it.