John Mayer breaks his silence on ex-girlfriend Jessica Simpson's memoir during ...

His ex-girlfriend Jessica Simpson said in her memoir Open Book that a therapist once suggested that John Mayer 'probably never loved her' and was just 'obsessed with her.'

And during his appearance on Watch What Happens Live, John was asked by host Andy Cohen during the segment Never Have I Ever about the book.

John, 42, said: 'I've heard about it.  I heard some things.'

Adding: 'But as Pee Wee Herman says in Pee Wee's Big Adventure before the movie of his life is about to play out at the end, he's not watching the movie and the reason he's not watching the movie, he says, "I don't have to watch it Dottie, I lived it." And I think that's prescient here.'

During his appearance on Watch What Happens Live, John Mayer was asked by host Andy Cohen during the segment Never Have I Ever about ex-girlfriend Jessica Simpson's memoir

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During his appearance on Watch What Happens Live, John Mayer was asked by host Andy Cohen during the segment Never Have I Ever about ex-girlfriend Jessica Simpson's memoir

The stars had a turbulent relationship from 2006 until they split 2007, which Jessica had said in the memoir was one of the factors that led her to an addiction to alcohol and pills.

Jessica, 39, had recalled in the memoir, which as released February 4, that after just a few months of dating, John repeatedly told her how 'obsessed' he was with her, 'sexually and emotionally.'

After her divorce from Nick Lachey in 2005, she started dating - while John kept sending her notes.

At this point, the singer told her that 'he wanted to have all of me or nothing,' she wrote in her memoir. 

Throwback: His ex-girlfriend Jessica Simpson said in her memoir Open Book that a therapist once suggest that John Mayer 'probably never loved her' and was just 'obsessed with her;' seen together in May 2007 in NYC

Throwback: His ex-girlfriend Jessica Simpson said in her memoir Open Book that a therapist once suggest that John Mayer 'probably never loved her' and was just 'obsessed with her;' seen together in May 2007 in NYC

Candid: Adding: 'But as Pee Wee Herman says in Pee Wee's Big Adventure' before the movie of his life is about to play out at the end, he's not watching the movie and the reason he's not watching the movie, he says,

Candid: Adding: 'But as Pee Wee Herman says in Pee Wee's Big Adventure' before the movie of his life is about to play out at the end, he's not watching the movie and the reason he's not watching the movie, he says, "I don't have to watch it Dottie, I lived it." And I think that's prescient here'

Jessica 'didn't really know the man behind the guitar. And that was my mission.'

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On his charisma, Jessica said: 'He'd walk into a room and pick up his guitar and you'd swoon.'

In her memoir, the mother of three said she met the singer in early 2005 at Clive Davis' Grammy party.

He came up to her and told her he admired her song With You, which she had written; following their meeting, he began writing her notes.

After secretly dating a few months, she fell in

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