Polly deepens as a character by standing up to the thieves when Macheath announces she is their new crime boss. She is gradually dragged into taking an active role in Macheath’s unpleasant business as a result of her love. When Polly enters, all she wants is for Macheath to flee and to be safe. However, when Macheath insists that she learn about the business, she resists at first but then slowly starts to agree to her responsibilities as a way of showing her love for him. By accepting these new responsibilities, she begins to change. And as soon as Macheath’s criminals show up, she proves that she is ready for the task of running the gang by exploding into a rage at Matthew. This roughness displays a side of Polly that has not been seen yet. She is not just a naïve girl trying to fit in with a dangerous crowd; she has reserves of toughness and perhaps cruelty within her. Nevertheless, she remains primarily defined by her love, as she drops her hardened attitude when the thieves leave. Yet she seems to have grown deeper nonetheless by taking over her husband’s business. At the end of the scene, she acknowledges what has been apparent all along, that he is untrustworthy and will break her heart.