“Walt really lost me when
he turned on Gus. He had the perfect set-up to just cook,
and not have to deal with moving the merchandise.”
No way. Walt was a dead man walking, unless he killed Gus first.
Killing Gus is one of the few actually defensible things Walt does.
Gus was doing his best to replace Walt and Jesse since season 3. With Gale first. Then the deal with the drug pair and Tomas and Jesse. Then playing Jesse against Walt to have Jesse eventually agree to takeover. Walt was in survival mode as he saw what Gus was trying to do. Gus needed Jesse, so did Walt. Walt won.
Why did Gus and Walt have a falling out? it seemed like the perfect working relationship