Daniel, Me Estás Matando brings us a bittersweet reflection on lost happiness in "Hace Mucho Tiempo" [A Long Time Ago]. The singer looks back to a time "cuando yo era feliz" [when I was happy], waking up to a kiss, completely wrapped up in someone. It's a feeling of deep regret, wondering "ni siquiera entiendo cómo fue que no vi" [I don't even understand how I didn't see] what was happening. He laments how the very best of her laughter now makes her suffer, and how his own talent has been stolen, leaving him ashamed.
He admits he was "ciego a tantos besos" [blind to so many kisses], crying in secret. Now that she's gone, he imagines her discovering his notebook, full of his feelings, saying "diciéndome te quiero" [telling me I love you]. It's a powerful image of unexpressed love and the pain of realizing what you had only after it's gone. The repeated plea "por favor, no" [please, no] at the end really drives home the desperation and longing for a past that can't be recovered.