Miley Cyrus is 'desperate' to win her fiance Liam Hemsworth back and feels responsible for their recent split.The 20-year-old singer is terrified 'The Hunger Games' star - who has been staying in his new Australian bachelor pad in the wake of their sudden split amid claims he cheated on her - won't communicate with her and is willing to do whatever it takes to win him after initially being intent on humiliating him.A source close to Miley told gossip website RadarOnline.com: "Miley is super independent, which Liam loves about her, but at the same time she's an insecure girl who's terrified of losing him and will do whatever it takes to make their relationship work."Liam, who was previously said to have grown tired of Miley's partying, was allegedly spotted flirting with Emma Watson and leaving a bash at the Chateau Marmont with January Jones last month, while his fiancee was enjoying a night out elsewhere in Los Angeles.But according to the insider, Miley now feels responsible for their split, saying: "This just goes to show Miley's immaturity and lack of relationship experience -- that she's the one who's dying to make it work with Liam, when he's the one who strayed from their relationship!"Miley can be a super jealous girl and feels like she probably pushed Liam away.Â "And even though she doesn't really want to tame her wild ways, if she wants to keep Liam she's going to have to. Either that, or she'll completely rebel because she's hurt and act out even more."On the outside Miley likes to appear like she's bad-ass and nothing bothers her, but on the inside she wants to be loved and doesn't think she could ever snag another guy as amazing as Liam."