Walt and Gus have always had a contentious relationship. That happens sometimes in the crystal meth business, especially when people start dying. On Sunday's episode of 'Breaking Bad' (Sundays, 10PM on AMC), the relationship got even worse when Walt's partner, Jesse, promised to kill Gus, the man responsible for distributing the meth Walt makes.
Walt pushed Jesse not to trust Gus, reminding him of all of the horrific things that have happened under Gus's watch. But to kill Gus, Jesse would have to get close to him, which would require forgetting all of those horrific things. "What about this girlfriend of yours?" said Walt. "And her little brother? The man looked you straight in the eye and told you no more children, but that very night, that little boy, he winds up -- Gus can't possibly think you'd forget that."