Jealousy is, I think, the worst of all faults because it makes a victim of both parties.

Tierney’s remark frames jealousy not as a private feeling but as a relational harm. By calling it “the worst of all faults,” she treats jealousy as uniquely corrosive: it punishes the jealous person with suspicion, anxiety, and self-torment, while also burdening the partner (or perceived rival) with mistrust and constraint. The key insight is the symmetry of damage—jealousy creates a closed system of suffering in which neither side can “win,” because even reassurance can be reinterpreted as deception. The line also implies a moral critique: jealousy is a fault of character that converts love into possession and turns intimacy into surveillance, making mutual victimhood its defining outcome.