Am I a dick for not switching days off with my female coworker?

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Of course not. Unless you told her off or something. I mean, it would've been nice if you did, but I don't think it's mean that you didn't.
For all your gaming pleasures: http://www.youtube.com/user/thismikeplaysgames
Currently Playing: Majora's Mask, Final Fantasy XIII, Shadow of Mordor