Kim didn't know for sure until she put out the bait for Jimmy. If Jimmy is guilty, he moves to cover his tracks, if not he just falls asleep.
He took the bait big time.
They flashed over the two toothbrushes before Kim and Jimmy's conversation in bed. I bet that Jimmy gets back home and there is only one toothbrush. Hell, they might just open the next episode with the shot of a single toothbrush. Kim will leave him now that she knows that he ****ed over his brother.
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