Proof that sometimes even the deepest of relationships can die a slow death: Things are not going well between Miley Cyrus and Liam Hemsworth. Though they're still technically together despite incessant rumors of a split, sources tell Life & Style that won't be true for long, Australia's News Network reports. The only reason Hemsworth hasn't actually walked away? "They broke up before and Miley went insane," a source says. "He felt so guilty, he went back to her and now he's concerned about what will happen if he leaves again."