They do not fear the beloved's disloyalty, as what happiness can it bring? We have known and experienced this; we are the ones who cast away all worries.

This couplet speaks to a profound understanding of love and detachment. The poet says that some people, perhaps referring to themselves and their kind, are neither afraid of a beloved's unfaithfulness nor do they find any joy in it. They've moved beyond such emotional extremes. They declare, "We have known it, we have experienced it." This suggests a wisdom gained through life's trials. They are "those who cast away worries," implying a state of inner peace and resilience where the fear of betrayal no longer holds sway. It's about finding freedom from emotional attachment and embracing a worry-free existence.