In his lane, my ruin was complete, so no one now sighs or laments.

This couplet is a masterclass in resignation. Mir Taqi Mir suggests that the very presence of the beloved (or the world associated with them) was the source of the poet's ultimate downfall. The pain was so deep, so ingrained, that now, the poet feels that any further lamenting or crying out is pointless. It's not just about the loss; it's about the acceptance of the fate that the beloved dictated. A powerful declaration of emotional exhaustion.