I do not understand what kind of veil or reserve they maintain against me, when they show no modesty or hesitation toward others at all.

In this couplet, the poet makes a delightfully tender complaint: the beloved mingles freely with the rest of the world, yet puts on a veil of modesty only when the lover appears. While it feels like an unfair and aloof rejection on the surface, poetry often treats this selective coyness as an ironic compliment. One rarely blushes or hides before just anyone—this very hesitation reveals that the lover's gaze has a power no ordinary person holds.