Rafael was very popular and admired at the time he went to the contest, both in Spain and Latin America.
But, at the same time, it was the focus of much criticism and envy. Many times because of his way of singing (not very masculine for those years in Spain) or because of his happy marriage.
"Nobody knows what I like or what I don't like. Nobody knows what I prefer in love. Nobody knows what my heart vibrates for”,,, It is a very powerful lyric, very vindictive, and where he told the world that who were they to criticize him.
Apart from being a very beautiful song, its message and lyrics are still very modern.
https://www.youtube.com/watch?v=oDStB4Kp91k
https://open.spotify.com/track/6k9IY8ZUD0wihrL4Ch7Upn?si=dd28d1b29f26411d