Sita was unaware that the person standing out side was an evil. If she had known, there wouldn't be Ramayan. 😊
But here Radhika totally knew who she was meeting with at those wee hours and she had total knowledge of her surroundings. In spite of this she went ahead. This is called act of IRRESPONSIBILITY.
HUSBAND and WIFE are not just words. They do come with some responsibility and obligation. "The day after the marriage is not same as the day before that marriage." As I said in my other post, a wise Radhika would have taken Dev into confidence and would have told him to come along with her to help Vishaka.
You know, Dev or Daadi may not think bad about Radhika. What about public? Amma will not hesitate to malign Radhika in public in order to safeguard Vishaka. Being a Raj Purohit, Dev has a public face too. And being a wife of such person it is also Radhika's responsibility to protect Dev's IDENTITY. Alas, she just butchered Dev's trust and his honor.
How else could Dev possibly protect her if she is acting all mad under his nose. It could cost Radhika her sasural.