I also think it was a good thing that Nick didn't tell Juliette that Alicia was a wesen, that's not really his secret to tell and he probably didn't want to risk being identified as a Grimm and scaring his friend even more than what she already is which is why he left so suddenly deep in thought. It will also create…

I believe that they showed Nick creeping on the girl just like in the first episode because they are trying to show that before, the Wesen were the monsters but now Nick may have the potential to become a monster but is still choosing to do the right thing. They may be hinting at some future developments in the show…