That song was originaly named "Somos Novios" and was written by Armando Manzanero, a mexican man. The song is about a couple, how is to date someone... Sorry, can't explain it well, but let me tell is a very romantic and beautiful song.
You can listen a version (in spanish) sang by Luis Miguel, very famous artist, just checkin' this link (Press the play button and that's it).: http://www.anos60.com/latina/luis_miguel/novios.htm