What a bummer, so sorry! Is something in there munching on the base of the plant? Did it get too dry? Is it in the same pot in which it was purchased?

Definitely nothing munching on it, I can tell you that! And I don't think it got too dry, I usually water it with maybe a 1/4 cup of water ever other week? And it's in the same spot since when I brought it home - no changes :-(

This is why I was so surprised! Not sure how I should even take care of it now!

Sorry for the loss Katie, a bummer indeed.

But pls. take a couple of pix showing us the entire plant, pot & all. From here that mix looks fairly water retentive, like it's not fast draining, which can be a problem for most succulents.

Any creatures (big dog, adventurous cats) that might have knocked into it causing the leaves to snap?

You could let those leaves dry several days (apply some cinnamon as antifungal & then shake off the excess) & then pot them in a small clay pot in shallow, fast draining mix to re-root them, so that they'll resume growing &/or make some new pups for ya. Wait several days BEFORE watering pls.

W/out knowing the size of the plants/pot it's hard to say whether 1/4 cup of water every other week suffices.

Is any part of the bottom there soft &/or mushy?

I have one of these in a 6ich pot and it hardly ever gets watered. Im sure it can go a month or so without watering. Especially in low light.

Looks like something broke them off. Kept too dark but still looks healthy from what I can see. I would cut back on the watering for now.