In Caprica, what caused the deterioration in friendship between Joseph Adama and Gautreau?

First - Historic Context:

The Adamas are a Tauron family who live in Caprica City. They have strong connections to their homeworld, other local Taurons, and to the Tauron-based criminal organization, Ha'la'tha.

William Adama Sr. and Isabelle Adama are poor farmers on the planet, Tauron. They have two sons, Joseph and Sam. They are members of a Tauron resistance group called the Ha'la'tha. The Ha'la'tha fights the corrupt Tauron government, its military arm, the Heraclides, and their murder squads, the Heracs.

The Adamas are a Tauron family who live in Caprica City. They have strong connections to their homeworld, other local Taurons, and to the Tauron-based criminal organization, Ha'la'tha.

William Adama Sr. and Isabelle Adama are poor farmers on the planet, Tauron. They have two sons, Joseph and Sam. They are members of a Tauron resistance group called the Ha'la'tha. The Ha'la'tha fights the corrupt Tauron government, its military arm, the Heraclides, and their murder squads, the Heracs.

The brothers Joseph and Sam Adama immigrate to Caprica as children after they are orphaned in the Tauron Civil War (12YR - 14YR). They move to Caprica City. Sam and Joseph join the Ha'la'tha as children. The boss of the Caprican Ha'la'tha, the Guatrau, takes them under his wing. By this time the Ha'la'tha has become an organized crime organization. ("Pilot")

While growing up on Caprica, Sam unsuccessfully hits on the guys in Little Tauron, the Tauron enclave in Caprica City. He grows up to become a Ha'la'tha enforcer. Sam marries a non-Tauron by the name of Larry. They do not have children because of the dangerous nature of Sam's job with the Ha'la'tha. Their marriage is a happy one.

The Story in the first season of Caprica:

In order to regain control of his company from Tomas Vergis, Daniel Graystone makes a deal with the Guatrau for funding to develop the Resurrection Program and "influence" to convince the board to oust Vergis. The Guatrau tells Joseph Adama to represent his interests at Graystone. Joseph begins to object, but the Guatrau tells him this is an honor. ("Unvanquished")

The Guatrau's shell company, Obolus Inc., purchases Graystone Industries. Daniel hopes that the Guatrau will let him remain in control of the company. However, the Gautrau attends a meeting at which Cyrus Xander demonstrates a proposed commercial for the Resurrection Program. Daniel wants the commercial scrubbed, but the Guatrau overrules him. ("Unvanquished") ("False Labor") ("Dirteaters")

As Joseph and Sam Adama are about to be promoted in the Ha'la'tha, the Guatrau tells the story of how they met. The Adama brothers had immigrated to Caprica as orphans. Sam tried to pick his pocket. Right then he knew that Sam had the stones to be one of them. The Guatrau noticed Joseph's eyes. He was always calculating something. They are like sons to him. ("Dirteaters")

His daughter, Fidelia, is released from prison. She goes to Graystone Industries to get caught up on the family business. She investigates the books and finds discrepancies about some missing robots. She has discovered Joseph's and Sam's secret operation to funnel robots to the resistance on Tauron. ("The Heavens Will Rise")

She brings this evidence to her father, but he refuses to listen to her. He says the Adama brothers are like sons to him and they would not do this. She tells him she is his actual daughter and he trusts her to tell him what others are afraid to tell him, and what he cannot face himself. She says the Adamas' robot operation to Tauron will be popular and will make him look bad. He tells her to make it quick and painless. ("Here Be Dragons") http://caprica.wikia.com/wiki/Guatrau

So ultimately, because of the secret operation of sending the robots to Tuaron, the Guatrau sees this as a betrayal, because it will make him look bad, not caring for the Tauron people that he allegedly says he cares for.