It is bad to steal.
Bella is at her friend Kristen's house when she notices that Kristen has a really cute new dress.
Bella wants to wear the dress.
Bella tells Kristen she really likes the dress and asks if she can borrow it for a night out some time.
Bella slips the dress into her backpack before she leaves and takes it home without telling Kristen.
Kristen is happy Bella likes the dress and lets her wear it a few times.
Kristen finds out Bella took the dress and ends their friendship.