Settlement talks between Mariah Carey and James Packer have broken down.

The singer and the billionaire businessman recently ended their engagement and were reported to be in negotiations for a financial settlement for Mariah, who wanted $50 million after claiming she had to uproot her life and move to Los Angeles for him.

TMZ reports that James insists there is ''no legal basis'' for him to pay Mariah anything as they weren't married.

However, she has accused him of being a ''lying opportunist'' and claimed he used her fame to help secure lucrative business deals.

Mariah, 46, was said to have been left ''blindsided'' when James called off their engagement.

A source recently said: ''The split has been devastating for Mariah. She loved James and was planning to marry him. She made life changes for this man to prepare for their future as husband and wife, even relocating to Los Angeles, at James' request, so he could be closer to his children.

''Everything she has done over the past year is to prove how fully committed she is to their life together. She really wanted this to work. And then, completely out of the blue, it imploded.''

And the singer - who has five-year-old twins Moroccan and Monroe with her ex-husband Nick Cannon - is determined to get a financial settlement.

However, a source close to the couple recently said: ''Of course Mariah wants money, but she's not getting $50 million. There's no negotiations about money because they haven't spoken since the split.

''He let her keep the engagement ring, and she isn't getting a cent more.''