In her new tell all book, Secrets of an Essex Girl, Lauren says how six years ago Jade told her that Mark had been unfaithful and called her an 'idiot' for staying with him.
The 26-year-old told Now magazine: "Jade thought Mark was an a**ehole."
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"She'd heard things and seen things that Mark had done with other girls. She said to me, "You're an idiot.""
Jade knew Mark as at the time he was one of her husband, Jack Tweed's best friends.
To make matters worse, Lauren says that at the time Mark was alleged to have cheated, she had just undergone an abortion.
"I'd just fallen pregnant with Mark's baby and had a termination. But Jade was blunt with me and said: "He's been shagging other girls."'
At the time, TOWIE didn't exist and Lauren and Mark were in the midst of their ten year on and off relationship which finally ended for good after a failed engagement last year.
Sadly, Jade later discovered she had cervical cancer and lost her battle with the disease in 2009.