Cheryl, 25, is said to be furious with him for breaking his promise not to go partying, and also for embarrassing her after she had made a public stand for him saying he had a "beautiful soul".
A source said the Girls Aloud member is raging and has already blasted Ashley over the phone for breaking a "no clubbing" rule while she was away.
"She couldn't believe it was over another woman again and that Ashley had gone back on his word," the Daily Star quoted a source as saying.
"Cheryl told Ashley in no uncertain terms that he was in the doghouse and they need a serious talk about what happens next.
"She really tried to make the public love and forgive him. She wanted to prove to those who said she was crazy to take him back that they were wrong.
"Now she's left feeling foolish, and wondering whether he can ever be trusted," the source added. (ANI)