"They will probably end up together, but Cyrus is just giving him hell right now and trying to publicly humiliate him. They always argue about the people Cyrus hangs out with and her alcohol addiction and it made him especially uncomfortable when he was not home to supervise," femalefirst.co.uk quoted a source as saying.
MIley Cyrus reportedly pounced on the rumours that her 23-year-old fiance was spotted flirting with Emma Watson and leaving a party with January Jones in Los Angeles last month.
"The second Cyrus caught wind of Hemsworth being unfaithful, she took that as an opportunity to rip into him because he made her feel guilty all the time about her behaviour. But she never cheated on him," added the source.
According to the source, Hemsworth's PR firm has been trying to break them up for years.
"They think she is bad news for his image. He could be such a bigger star if he weren't with her. If Cyrus has her way, the breakup won't last because she's head over heels for Hemsworth and ultimately doesn't want to lose him.
"But now that Hemsworth is taking some time away from her, he might come to the realisation that she's not the best fit for him. And that terrifies Cyrus," said the source.