Perhaps Murgatroyd thought she was making a stand by leaving, so that she could tell herself that she was never dumped.
It was funny being told by Sierah how how hot and tall she was, moments before being dumped, then the potty-mouthed exit.
I rarely buy into the romance of these shows, but this season in particular seems especially clinical.
There is no connection between any of them, and if Jimmy is suddenly head over heels in love with one by the end, they haven't sold that journey to us.
Unless it was meant to be Brooke, who did seem quite sweet.