After a long 9 months Miley broke up with Justin. E! News reported

the following :

Speculation of trouble peaked yesterday when the two simultaneously twittered about tears and goodbyes. A source close to the couple says both of them are really heartbroken over the split. However, word is distance may not have been the only thing to come between the two. A certain famous ex-BF may have exacerbated the rift…
Gaston, a Louisiana native, has told pals that the star’s resurrected friendship with Nick Jonas this spring was his Achilles’ heel.
“She obviously has been hanging out with Nick again a lot, and Justin was cool with it at first, as long as it was just a cool, friendly thing,” says an insider. “She didn’t cheat, but I guess Nick was trying to get her back the whole time.”

I guess all good things must come to a end ? But I am sure we will now see Miley back with a Jonas brother. Good luck with that Miley !