Final answer:
In the situation described, Rosa and Nadia were upset because a breach of trust had occurred, with Rosa feeling betrayed and Nadia feeling remorseful for her actions.
Step-by-step explanation:
Rosa and Nadia regarded one another as best friends. Therefore, when Rosa learned that Nadia had repeated something she had told her in confidence, Rosa became very upset. Nadia apologized sincerely, but Rosa refused to forgive her, which made Nadia upset. In this situation, both Rosa and Nadia were upset because they perceived that a breach of trust had occurred.
This scenario demonstrates the complexities of human relationships and the impact of actions on friendship. The bond between Rosa and Nadia was jeopardized due to the breaking of confidentiality, a core element of trust. While Nadia's apology showed her remorse, Rosa could not easily overcome the betrayal, highlighting the delicate nature of trust and forgiveness.