The 27-year-old star's mother Joan is reportedly concerned Cheryl - who divorced the England and Chelsea soccer player in September 2010 amid revelations he cheated on her with different women - is going to have her "heart broken" once again.
An insider told the Daily Mirror newspaper: "No one close to Cheryl wants her to get back with Ashley. They've started talking again and friends are terrified he'll worm his way back into her affections - and she'll take him back.
"Her family believe, once a cheat, always a cheat - and Ashley will go and break her heart again. She doesn't have a lot of friends and doesn't know who to trust. That's why she has resorted to her ex-husband."
Meanwhile, the 'Promise This' hitmaker's close friend and manager Black Eyed Peas frontman will.i.am is said to be "demanding" to know whether she is planning to get back together with her former spouse.
A source told The Sun newspaper: "She is blinded by the hope of a future with Ashley. Her mum has told her there's nothing more she can do. And will.i.am is demanding to know what's going on."
The insider added: "Cheryl feels everyone has abandoned her. Her only friend is Kimberley - and sadly, Ashley."