How insensitive (insensatez)

How insensitive I must have seemed when she told me that she loved me
How unmoved 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?

Now she’s gone away and I’m alone with a mem’ry of her last look
Vague and drawn and sad I see it still, all her heartbreak in that last look

[in Portuguese:]
Ah, porque vocy foi fraco assim
Assim tao desalmado

What was I to do? What can one do when a love affair is over?