LATEST: Sir Paul McCartney has broken his silence on his relationship with ex-wife Heather Mills in a new song.
The former Beatle finalised his divorce from the former glamour model earlier this year (08) and has consistently refused to talk about his former spouse in public.
But MCCartney has now revealed his torment about the breakdown of his second marriage in a new ballad, titled My Soul, taken from his forthcoming album London Undersound.
The lyrics reference the former couple's struggle with the paparazzi and "secrets" that were kept from him.
He sings; "I want to know all your secrets.
"How could this steal all these feelings? How could they lie to the world? A picture away from your smile. One heart replaced. Feelings displaced. Invade our space."
A source tells British newspaper the Daily Mail, "What the song shows is that Paul just feels sorry for her. He feels sorry that she was never able to tell him the full truth about her past life.
"Paul knows Heather is a complex person, and deeply misunderstood, but she has hardly helped herself by being less than transparent about her life."
MCCartney and Mills split in 2006 and have a four-year-old daughter, Beatrice. MCCartney's first wife Linda died of cancer in 1998.