A component in my file stopped being a component - can I get it back?

I had a component with 5 states, and interactions (prototyping) which triggered each of those states.

It's been about 2 weeks since I worked on the file. When I opened it today, there was no green line around the group which had previously been a component. The interactions don't work, obviously. And obviously, since it's not a component anymore, my states are gone.

It was quite a bit of work to put that component + all its states together. 

HELP. Is there any way to get my component back? Is there somewhere that main states of components are saved, even after they're ungrouped? I'm willing to consider that I may have accidentally ungrouped the component in the last version... through some shortcut, but I can't believe it would be gone forever. It would be terrible program design to have all of the work done in many separate states disappear because a component gets ungrouped.

I've looked into the "versions" and although I haven't opened every single one (of 100 or so), I've opened a range, and none of them have the component intact, and I'm worried that it's because it's "linking" and if the component is broken or gone, then the link won't work for any of the versions. 

Any suggestions?