In Chapter 4 , Why does Gatsby want to have tea with Daisy in Nick's house? Why doesn't Gatsby ask Nick for this favor himself?

Gatsby is terrified that Daisy might refuse a personal invitation from him. Instead he contrives a scenario where by he can be alone with Daisy. Gatsby is still intensely private at this point. He still puts up a front so Nick is yet to know what Gatsby is really like.