Hello Lindsey! I agree with Baja, the plant is etiolating so it is getting stretchy, trying to get more light. Typical to lose older leaves like it does now on your plant, and I do see active growth at the tip, so it is still doing okay.. At times it may start getting too top heavy, so you may chop off the rosette, callus and repot. There are times too, when conditions are right, new rosettes may form up and down the stem.
Not sure which one you have there, but most of my succulents that looks like that, behaves as such, and I already grow them outdoors in containers, they just love the sun here.
