Act II : Will Nora lose her doll house?

Act II was quite interesting. Secrets were revealed and the drama is just piling up. At this point in the play Nora has confessed her biggest secret to Mrs.Linde. We learned that Mrs.Linde now knows everything that is going on between Nora and Krogstad and the type of relationship they have. During this act there’s a scene where Mrs.Linde and Nora are have a conversation about how Krogstad placed a letter in their mailbox for Torvald explaining EVERYTHING to him to try and clear his disreputable name. While they’re talking Mrs.Linde said something very interesting. She said “There was a time when he would gladly have done anything for me.” Is this foreshadowing something? Well, we all know the answer to that question but I thought it was slick how she briefly mentioned it and then took matters into her own hands. Personally, I think that writing that letter was such an immoral thing to do on Krogstad part. He’s set on that mentality that if he’s going to lose his job because Nora won’t secure it, he’s going to bring her down with him. That’s so messed up. He knows exactly what Nora’s feeling because he’s been in that situation before yet he’s putting her through this excruciating reproach for his personal gain. In addition to all of this we find out that Dr.Rank, the very close family friend, has been secretly head over heals for Nora all of these years. SO, so far we have a dieing doctor in love with his “best friends” wife, a man trying to save his job and refinement by black mailing and later snitching on a woman he’s known for many years (ironic much?), a husband who is so wrapped up with preserving his reputation he doesn’t care if it costs him his happiness, and a woman with a HUGE secret that could cost her, her marriage, children and doll house.