Soooo... Despite being a burly, heterosexual man, I'm pretty gay for Jack White. When news broke that the White Stripes were officially done, I was sad to say the least. The following performance was the last song from their tour documentary, Under Great White Northern Lights. Though they would go on to do one more public performance on the farewell episode of Late Night with Conan O'Brien (one that felt kind of awkward, really), I like to think of this is as their last song together.
We can only speculate as to why Meg was bawling her eyes out. I don't think it matters. There is so much intimacy and emotion and soul there... so much story that we just aren't meant to know. And for a band that played everything (except the music) so close to the chest, it seems only fitting that it ended on such a mysterious note.