Final answer:
Gerda might choose not to tell her parents about her conversation with Peter, even after discovering Arthur is alive, because of fear, lack of understanding, and a desire to protect Arthur's secret identity.
Step-by-step explanation:
In the given texts, Gerda, Nora, and other characters choose not to tell their parents or husbands about certain conversations or secrets. There are a few reasons why Gerda might make this decision after Arthur is discovered to be alive.
Firstly, she might be afraid of how her parents would react to her interactions with Peter, especially if they disapproved. Secondly, she might believe that her parents would not understand or support her choices. Lastly, Gerda might want to protect Arthur's secret identity and not create more complications for herself and her family.