The letter

One grows weary of everything, my angel. It is the law of nature, it is not my fault.
If for example I had as much love as you have virtue, and that is surely saying a lot, is it not astonishing that we should end at the same time as the other ? It is not my fault.
From this, it follows that for some time I have been deceiving you. But then, your pitiless affection forced me as it were to do so. It is not my fault.
Today, a woman I love madly insists that I sacrifice you to her. It is not my fault.
I realise that this is a fine opportunity for crying out on perjury, but if nature's only given men assurance, or if she gave women obstinacy, it is not my fault.
Take my advice: choose another lover, as I have chosen another mistress. This is good advice. Very good. If you think it bad, it is not my fault.
Farewell, my angel, I took you with pleasure, I abandon you without regret. Perhaps I will come back, to you. So goes the world, it is not my fault.