In The Great Gatsby why does gatsby deliver so many goods to nicks house?

Gatsby leaves Nick's house shortly after he arrives on the day that Nick has invited Daisy over upon Gatsby's request because he is too nervous and wants it to seem like a coincident that Gatsby is there. He leaves when Daisy arrives, but circles around the house and comes back after walking in the rain.

-- that's the only time i can think of that Gatsby is ever at Nick's house