Warning: SPOILERS for Better Call Saul season 6, episode 9.
Better Call Saul season 6 sees the inevitable breakup of Jimmy McGill and Kim Wexler, but one infamous line in Breaking Bad proves that ending the relationship was the best decision for all. After all of the theories about why Kim is absent from Breaking Bad, it's ironic that the reason is the simplest of all: that she broke up with Jimmy. The ending of Kim's story in Better Call Saul was the last mystery that the prequel show had to unveil after the fate of Nacho Varga, the death of Lalo Salamanca, and the explanation for Saul Goodman's Breaking Bad line about Lalo.
Their breakup paves the way for Jimmy to complete his transformation into Saul Goodman, as seen by the flashforward in Better Call Saul season 6, episode 9, «Fun and Games.» This transformation is only possible because Jimmy can no longer protect someone else and thus the consequences of his actions as Saul Goodman fall upon him alone. Kim and Jimmy's relationship made them a force to be reckoned with, but that didn't come without consequences, as their plan against Howard Hamlin resulted in him being at the wrong place at the wrong time and ultimately killed by Lalo Salamanca.
Related: It's Official: Jimmy McGill Is Dead In Better Call Saul
In the aftermath of Howard's death, Better Call Saul season 6, episode 9 shows the pair attempting to go on with their days as usual, with their façades cracking once they get back to their apartment — the place where Howard was killed. In an attempt to console Kim, Jimmy says: "One day we'll wake up and brush our teeth and go to work, and at some point, we'll suddenly realize that we haven't thought about it at all. None of it. And that's when we'll know. We'll
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