I have thoughts on that duet of Klaine's, too. My current working theory (among others) is that they're actually singing it as other plot events happen (think Cough Syrup if you will). I also think it's very possible they're singing it to Rachel post whatever goes down. The song itself when you listen to it is actually not that sad or melancholy.
I'd say its reflective at best. There's no hint (to me, anyway) that its intended to be thought of as a break up song taken as it sounds and certainly as 1D spun it. We shall see.
Okay done speculating for real. :)
















