White took her own life shortly after they broke up last year. The note, which was found along with White's body last year, has now emerged online, reported TMZ.
It details how heartbroken she was after she broke up with the 54-year-old "Dumb and Dumber" actor.
"I've spent 3 days now in disbelief that you're not here. I can go on brokenhearted and try to put the pieces back. I could, I just don't have the will this time," she wrote in the letter, adding, "I'm sorry you felt I wasn't there for you. I tried to give you my best part."