This is a young Luis Miguel begging someone not to walk out on him, and he does it with almost no pride at all. The whole chorus is one plea: "No me puedes dejar así" (You can't leave me like this), "como un tonto pensando en ti" (like a fool thinking about you), "sin saber por qué te vas" (without knowing why you're leaving). Then the bargaining starts: "Quédate un poquito más" (Stay a little bit longer). That poquito, the tiny version of poco, is doing a lot of work. He isn't asking for forever, just a few more minutes.
The verses are pure upbeat 80s pop. She's someone who stands out, "cuando vas saltando entre la gente" (when you go jumping through the crowd), and he dreams of running off with her to "dar la vuelta al mundo en un segundo" (go around the world in a second) as "super millonarios, vagabundos" (super millionaires, vagabonds), which is a fun contradiction. My favourite line is the slightly silly "La lluvia llueve, el mar se mueve" (The rain rains, the sea moves). It sounds obvious, and it is, but it's a great one for learners: llover gives you llueve, and mover gives you se mueve, two stem-changing verbs in one breath.