i haven't done anything to delete it, and i save regularly, did my data delete itself?

You offline or on? Or is this that your game listing vanished?

I have the same problem myself, I'm always online by the way

I work offline. That way I control my copy. And I version my code.

The thing is, I've heard about stuff vanishing. I've also had the editor suddenly start working weird. I'm always careful to have a fallback position.