Radak: Yerushalayim is compared to a tent, and Arei Yehudah like ropes [that hold up] the tent. Malbim - since the ropes snapped, I cannot pitch the tent elsewhere.

Rashi: Yerushalayim says, my children left me.

Radak: The nation are like children to the Navi, who chastises them like a father chastises his son, if they will heed him. They were exiled with Yehoyachin. Similarly, "Chazaktani va'Tuchal" (20:7) means 'You were stronger Mimeni (than me).'

Malbim: Even if I would find new ropes, my children left, so I cannot pitch the tent again].

Radak: If I will say that there will be another king who will pitch the tent (Yerushalayim) that was plundered - I see that there is no place of the curtains that fell; the tent is made of curtains.