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Actress, comedian and autism activist Jenny McCarthy has never been shy about sharing her private life with the public. Still, those following the actress' five-year relationship with boyfriend Jim Carrey were shocked and saddened by a pair of tweets in April 2010.

Jenny tweeted: "I'm so grateful for the years Jim and I had together. I will stay committed to Jane [Jim's daughter from his first marriage] and will always keep Jim as a leading man in my heart."

At about the same time, Jim's followers received this message: "Jenny and I have just ended our 5yr relationship. I'm grateful 4 the many blessings we've shared and I wish her the very best! S'okay!"

Now, Jenny's joining Oprah to talk about their breakup for the very first time—and revealing why she's documenting her love lessons in a racy new book, Love, Lust and Faking It.