Rose is prepping the OR when Derek walks in, and there's some cutesy banter about who's late and who's early that doesn't warrant actual recapping. When they stop, there's a moment, and Derek looks down until Rose notes that he's staring at her chest. He's caught off-guard, and she allows that he's probably looking at her ring (which she's wearing on a chain a la Carrie Bradshaw) but that it's coming off like he's just staring at her chest. He apologizes, then notes the obvious, that her engagement ring is on a necklace. She replies that when she was engaged, it was on her finger. And that is enough right there for me to say, "Run, Derek! Run!" She explains that she doesn't want to lose the stone, which was her grandmother's. I think that would be the reason that most people would, say, oh, get a safe deposit box? Have the stone removed from the ring, and store it somewhere safer than a chain that could break? And that is politely ignoring the fact that it's downright creepy, since she's not actually engaged to this man anymore.
Derek asks when it ended, and after she admonishes him for the personal question, and he bantering back about the friends/licorice thing ohmygodjusthavesexalready, she says they broke up a year ago and that it was never going to work out. I repeat, and with extra repetitions, for emphasis, "Run, Derek! Run! Run! Run!" But of course, because they have some sort of magical flirty attraction, that isn't the point; the point is that she needed to have some sort of vehicle for saying that she and her fiancĂ© didn't work out because "I was always very clear about what I wanted and he...wasn't. There's no way to build a future on that." And now I can actually look through my floor and wave at my downstairs neighbor, after the anvil came plummeting into my living room with such force that it tore straight through the building.