The former Hills star has been spotted smooching the Dancing With the Stars pro at various Los Angeles night clubs over the past month, but a source told Life & Style magazine their flirtations are now done and dusted.
'Their relationship reached its peak,' said the source. 'It was always casual.'
'She had fun with Derek - he used to send her cute texts and sing to her - but she always kept her options open,' a second insider said.
A third said Conrad was simply 'rebounding' after splitting with actor Kyle Howard, her lover of three years. 'This was a rebound that wasn't going to last. Derek never thought it would, either.'