To be honest, I think it faded long before that. I mean, don’t get me wrong, not a Nadalind fan AT ALL but this is one thing I don’t think we can lay at that ship’s door. Monroe and Nick’s bromance dropped by like 80% around mid-season 2, after Monrosalee really took off and Hank learned the truth and became part of Team Grimm.
That’s not to say that either Hank or Monrosalee should be blamed for it, either…I think it was just a natural side effect of the show’s transition to an ensemble cast. It was nice, though, in the last two seasons, to see them call back to the importance of that early relationship and give it a few more great moments.