In the chapter, "Story of my Marriage" in the book Zeno's Conscience by Italo Svevo, what is the relationship between Zeno and Guido?

Zeno and Guido's relationship is somewhat competetive..... one is always trying to out do or humiliate the other. One reason for Zeno's actions can be found in the fact that he is a bit jealous and suspicious of Guido's relationship with Ada.