Better Call Saul
Kim doesn’t know for sure that Jimmy messed up Chuck for her to get the client right? She knows that losing the client is what pushed him over the edge but if she is starting to accept that Jimmy is ultimately why then she may be starting to feel remorse and guilt about having Mesa Verde and the success associated with it, hence the sadness about the expansion.
Also along with that would be the growing realization that Jimmy apparently has no guilt about what happened to Chuck even though he was a pretty direct cause of it and that she cannot possibly be with him.
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