Roughly translated, the lyrics are:

Esa Noche – (Cafe Tacuba)
You shouldn’t have left me that night,
because that night I found a new love.
You shouldn’t have left me that night,
because that night I found a new love.
It seemed she was waiting the moment of your departure.
She seemed to have observed my moments with you.
You shouldn’t have left me that night,
because that night I found a new love.
You shouldn’t have left me that night,
because that night I found a new love -
who embraced me tightly
as soon as you said good bye to me.
It wasn´t a big sadness,
Was a change from less to more…
I was waiting for your return, but I saw you so happy
in your lover´s arms.
You forgot about me.
But now you think about me?
Come back into my arms.
I´ll be your lover forever -
your girlfriend, the loneliness.
…and if someday you return to
the One who loves you…
You know, she will not be the same
because she knew me too.
You shouldn’t have left me that night,
because that night I found a new love.
My loneliness, I always have belonged to you.
My loneliness, I always have belonged to you.
Oh, my loneliness, I always have belonged to you.