This chapter presents a reading of the theme of elegiac/erotic fides (fidelity) in Propertius 3.6. The chapter argues that this poem – by using a conceit derived from Roman comedy in which a slave (Lygdamus) acts as a go-between for the lover and his mistress – invites a metapoetic interpretation in which the narrating slave acts as surrogate for the poet/text, while Propertius himself occupies a position analogous to that of a reader of elegy. WIthin this system the poem suggests a synergy between the ‘fides’ – the ‘good faith’ – expected by lovers of each other, and that expected of a text by its reader; the poem suggests that lovers and readers alike are willing to let themselves be deceived in the pursuit of erotic or literary pleasure.