A goodbye at a train station, more or less. It opens with the title line, "Te juro que te amo" (I swear I love you), and then sets the scene in two quick strokes: "Afuera está lloviendo, por dentro estoy temblando" (Outside it's raining, inside I'm shaking). She is leaving, and "un tren desconocido pronto tomarás" (soon you'll take an unknown train).
What makes it sweet rather than bitter is that he is sure she will come back. "Más, ¿por qué llorar? Si es que tú volverás" (But why cry, if you're coming back?). The chorus is a promise: "Y mis sentimientos no los cambiaré jamás" (And my feelings, I'll never change them). Learners, note the word order there: Spanish puts the object first and then repeats it with los, which English never does.
The closing "Me quedas tú" is lovely and hard to translate: roughly "I still have you" or "you're what I have left". Near the end he drops a playful "Ay-ay, chiquitita" (oh, little one) and signs his own name, "Es Eden Muñoz".