How do I use Pastebin?

So, I ended up dumping some thoughts over on pastebin.com and sent the link to a buddy of mine, but he went ahead and edited the thing, and now he can't seem to find any way to revert it back to how it was when I first wrote it.
Does anyone actually know the deal with how Pastebin works? Like, is there a way to undo those changes?
Here’s the text I’m talking about: right here