Act II ; sneaky sneaky little Nora

Is there something between Dr. Rank and Nora? during act II, Nora and Dr. Rank have a conversation alone. She shows him her skin tone stockings, which was not exactly proper from a woman to wear in this time period. As i was reading the two talk to each other the mental picture I got was Nora kind of not throwing herself to him but teasing him in a sense. I honestly think Nora has or had a thing for Dr. Rank but is inlove with her husband. What i dont understand is why does Nora react to when he tells her that he'd gladly give his life for her?

Later that night Nora and Torvald practice the tarantella, for the holiday party their attending the next night. She made him promise to stay away from all work for the night, to just focous on her, for Krogstads letter is still in the mailbox. Nora doesnt want her husband to know about her borrowing money and forging the signiture but if she continues this fake act, she'll lie til her she lays in her death bed. It'll always be on her mind and she'll never be at ease with herself. I think that she's extremly smart and knows how to get mostly what she wants but this changes my mind about her, I want her to woman up and tell her husband like a responsible adult what she has done, but she wont and now I have a better understanding of how she really is.