The Sun reports that the dancer, who dated the singer after meeting on the set for her ‘Parachutes’ music video is keen not to reveal details of their relationship.
The singer credited Derek for standing by her side when she contracted Malaria in 2011.
A source tells the newspaper: “Derek honestly thought Cheryl was the one when they were together. He doted on her every word and helped her come back emotionally after her split with Ashley.
“He was also at her bedside morning, noon and night when she suffered her malaria scare after their break to Africa. Cheryl had never been treated like that before and adored Derek.”
The source continued: “However, in 2011 she called time on their love affair when she moved full time back to England.
“Derek was devastated. He tried to win her back, but they never made it work.
“The scars are still there and we think he couldn’t re-live the heartache. Derek had kept the relationship a secret in the most part, but sharing his heartache was too much.”
Cheryl has since moved on, secretly marrying her new beau Jean-Bernard Fernandez-Versini when she announced the news via Instagram back in July. Whilst Derek has been rumoured to be dating Kate Hudson.