Final answer:
Chloe's behavior can be characterized as the promise breaker.
Step-by-step explanation:
Chloe's behavior can be characterized as the promise breaker. She made a commitment to Zack by agreeing to go to prom with him, but then she broke that promise when she accepted Michael's invitation instead.
This unhealthy characteristic shows a lack of integrity and respect for others. Breaking promises can hurt people's feelings and damage trust in relationships.
In this situation, Chloe should have communicated openly and honestly with Zack about her change of heart, rather than cancelling on him without explanation.