Ora, 24, started dating Tommy Hilfiger's rapper son shortly after her split from Calvin Harris in early 2014, reported Us magazine.
"They were both too busy, the distance got hard, and both agreed that it was better for them to be single but stay friends," a source said.
"She's too busy with X Factor (UK) and doing her new music for long distance, and he can't spend all his time here either. It just wasn't going to work out between them. It wasn't a nasty split. They're both still close and care about each other," the source added.