After killing me, they go around asking everyone who did this deed and who was responsible for it.

This couplet captures the sharp, bittersweet irony of heartbreak through feigned innocence. The beloved shatters the lover's heart—metaphorically slaying him—and then wanders among the crowd, casually asking who could have possibly done such a deed. It reflects that painful, almost amusing paradox in love where the one who causes your absolute ruin acts completely oblivious to it.