The unearthed letter – written on Catriona White’s iPad on April 8 2013 - blamed the actor for exposing her to a sordid life sex and drugs and scorned him for 'giving her' herpes.
According to the Daily Mail, the note was discovered by lawyers working on behalf of her family in their current lawsuit against the actor.
In the note White said Carrey knew what she wanted and it had “nothing to do with money”.
She said: “ ... you gave me [HSV] and [HPV], I want you to apologise for it because you care enough to.
“I want you to understand that however little a thing that seems to you, it ruins a girl’s life.
“I want you to take care when you are with other girls and pay attention to how your body, your [actions] affect people.”
White – who took her own life in September 2015 – then went on to explain how her relationship with Carey effectively destroyed her mental health.
“I met you, you introduced me to cocaine, prostitutes, mental abuse and disease”.
She said being with Carrey “broke” her down as a person.
“You did good things for me but being with you broke me down as a person Jim,” she said.
“I was promised Jekyl and instead I got Hyde,” she added. “You threw me away when you absorbed anything worthwhile that was left of me.”
According to a report by the LA county coroner’s officer, White died after taking a lethal cocktail of prescription drugs. She died only two weeks short of her 30th birthday.
White’s parents Brigid Sweetman and her husband Mark Burton blamed Carrey for the loss of their daughter and filed a wrongful-death lawsuit against him.
On Friday afternoon Carrey released a statement to the Daily Mail that said he filed a cross-complaint against Fillipo Marchino (White’s former lawyer), The X Law Group and Brigid Sweetman.
He said, “Unfortunately, I made the mistake three years ago of giving in and settling false claims made against me by Mr Marchino, on behalf of Cat, as mounting a public defence is a very costly and painful process.
“I will not give in a second time to these same fraudulent charges initiated by Cat’s husband in name but not substance Mark Burton, and her estranged mother.
“Nor am I responsible for what these desperate characters have inadvertently unearthed about the woman I adored. I was clearly blinded by my affection.”