While Gatsby and Daisy are beginning their affair, what is Nick doing?

from The Great Gatsby story

When nick learns that gatsdy is deeply in love with Daisy.He plans a reunion for both of them by inviting daisy for a Tea Party at his house,but he insures that Daisy does not come to know that Gatsdy is also invited in the Party.At the tea party Gatsby and daisy reestablish their connection

Nick then travels with tom and jordan to the valley of ashes to discover that Tom's lover Myrtle has been killed in an accident and the driver of the car was Gatsdy and then Nick along with Tom and Jordan travel back to long island to discover that the car by which the accident occur was driven by Daisy.

c. "but thy eternal summer shall not fade" (line 9)

he used romanticism in his works