"Their on- and off-again relationship is currently off," says the source. "But you never know with Miley and Liam. They could be back on at some point."
Adds another source close to Hemsworth: "There was no drama. The relationship just ran its course. They were good friends first and remain friends."
Maybe it's because Miley (who turns 18 in a few weeks) is 17 and travels the world?! That just might have something to do with her long term relationship status.
Don't worry Miley it gets better as you get older - just ask Hilary Duff or Katy Perry.