Oh I do know this song so well. Even though it’s rather the Latin version sung by Omara Portundo and Teresa Garcia Caturia. The song is there called “Quizas, quizas, quizas”.
You should listen to that version which is very close to the original.

Y asi pasan los dias
y yo desesperando
y tu, tu contestando
quizas, quizas, quizas.