With Sonnet 139, William Shakespeare finds himself quite comfortably in the domain of the classical Petrarchan sonnet, invoking the themes and poetic tropes that other sonneteers of the period, most notably Sir Philip Sidney in his Astrophel and Stella use to speak about their mistress's capacity to captivate and, if they so wish, kill them with their looks.

The initial plea with the mistress is simple and straightforward: I know you have other men, so when you are with me, just tell me to my face that this is the case, rather than flirting with them with furtive glances. Having devoted the octave – the eight lines of the first two quatrains – of his sonnet to this principal argument, he then uses the sestet – the six lines of the final quatrain and the closing couplet – to propose a somewhat sophistic excuse for his mistress's behaviour, allowing for the fanciful idea that she divert her devastating looks to other men so as to spare him additional suffering, which, he finally resolves she shouldn't do, since he'd rather 'die' – at least metaphorically – than be left in limbo...