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"Director Sam Taylor Johnson actually wanted to change the reason Christian and Anna break up in Fifty Shades is that he ignores their safe word. Which, as bad as that sounds, actually makes sense. In the book, Anna just can't handle the lifestyle. With that change, it cements what's been implied to be the actual problem with their relationship: Christian wants to control her but doesn't know how to control himself. This would also make their final conversation more powerful. Christian tries to stop her and she firmly says **no**, *making* him listen. It would create a theme that the books try and fail to make: this is about *boundaries*"