It was as if the whole world was another realm, merely by your passing by.

This couplet captures the intense vulnerability of love. Mir Taqi Mir is saying that if the beloved merely passes by, it is enough. Otherwise, the world—every other beautiful scene, every other joy—feels completely meaningless. It suggests that the mere proximity, or even the fleeting glance, of the beloved is the only thing that gives color and meaning to life.