Literally, the couplet means: Now, if the beloved, whose charms have been stolen from me, were to show affection towards my heart, then what would happen to me?

This beautiful couplet captures the profound pain of perceived abandonment. The poet feels that the mere act of the beloved leaving at dawn has broken his heart. Therefore, even if she later changes her mood and becomes affectionate, the speaker believes that change will be meaningless, because the initial wound of separation is too deep to heal.