"Insensatez" (usually translated to "How Insensitive" in English, although the Portuguese word really means 'absurdity' or 'folly') is a bossa nova jazz standard composed by Antônio Carlos Jobim, loosely based on Frederic Chopin's Prelude No.4 with lyrics by Vinícius de Moraes. The English lyrics were written by Norman Gimbel.
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http://en.wikipedia.org/wiki/How_Insensitive
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How insensitive
I must have seemed
When she told me that she loved me
How unnerved and cold
I must have seemed
When she told me so sincerely
Why she must have asked
Did I just turn and stare in icy silence
What was I to say?
What can you say
When a love affair is over?

Why she must have asked
Did I just turn and stare in icy silence
What was I to say?
What can you say
When a love affair is over?

So now she’s gone away
And I’m alone
With a memory of her last look
Vague and drawn and sad
I see it still
All the heartbreak in her last look
How she must have asked,
Could I just turn and stare in icy silence
What was I to do?
What can one do
When a love affair is over?