This is a breakup song sung from the middle of the wreckage. It opens cold: "No quiero saber de ti" [I don't want to know anything about you] and "Hoy nuestro amor fracasó" [today our love failed]. But the singer can't keep that tough face on for long. He insists he never wanted it to end, and that he really did love her: "Sabes bien que yo en verdad te amé" [you know well that I truly loved you].
The chorus is where it hurts. "Esta noche soñé con tu amor / Y no pude evitar sonreír" [tonight I dreamed of your love / and I couldn't help smiling], and then right after, "Estoy agonizando por ti" [I'm dying (agonizing) over you]. The image of the dream as "la flor que se marchitó" [the flower that withered] is simple but it works. Watch the word valor in "No queda valor para que te siga amando": here it means courage, not value, so he's saying he has no courage left to keep loving her. A learner trap worth remembering!