Why does it upset Nadia?

Nadia feels upset because she experiences a deep sense of betrayal and disappointment from someone she trusted. This situation likely challenges her beliefs or values, making her question her relationships and sense of security. Additionally, the emotional weight of the situation may amplify her feelings of sadness and frustration, leading her to feel isolated or misunderstood. Overall, it's a complex mix of personal hurt and the impact of others' actions on her life.