If my fate is to fall apart because of them, then I shall leave this city; I shall simply sleep with a pillow in the wilderness.

This powerful couplet speaks to an intense emotional dependency. The speaker is telling the beloved, 'If my life is ruined because of you, then leave this city.' The second line, 'How will I find a pillow in the wilderness?' is a profound declaration of emotional need. It means that the speaker's comfort, stability, and very existence are tied to the presence of the beloved and the life they share. Without them, the world is just a desolate, unbearable place.