Delta Goodrem reportedly tried to save her relationship with former Westlife star Brian McFadden before their split.
The Star reports that Goodrem made a last attempt to save their seven-year relationship by relocating to Los Angeles.
However her hopes that Brian would "clean up his act" in LA were allegedly dashed when his hard-partying pal DJ Kyle Sandilands moved too.
A source has claimed: "Brian hated LA and he couldn't get a job there but loves Australia.
"In Sydney he gets VIP seats in all of the clubs and never has to put his hand in his pocket but in LA no one knows who he is."
Goodrem apparently could no longer stand McFadden's "drinking, gambling and lavish spending.
"Delta thought moving to LA would take him out of that environment but a few weeks later along came Kyle and she was fuming."
They added: "She was always warning him to clean up his act or it would be over but he just assumed he could carry on partying regardless."
The paper also reports that the pair split after a row in LA when he became increasingly jealous about her relationships with musicians such as Nick Jonas of the Jonas Brothers and guitarist Greg Garbowsky.
McFadden celebrated his 31st birthday at the weekend with friends including Sandilands and England rugby star Danny Cipriani.