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Demi Lovato

Bullying is the

Root Problem

11/2/2010 1:20 PM PDT BY TMZ STAFF

The issues that Disney superstar Demi Lovato is hoping to tackle in her treatment center all stem from a painful history of being bullied ... sources extremely close to the singer tell TMZ.

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We're told Demi's issues with bullies go all the way back to middle school -- where she felt her acting career made her a target.  Our sources say Demi subsequently engaged in self-destructive behavior that is a manifestation of being bullied. 

In fact -- back in 2008, Demi told Ellen DeGeneres that she was bullied so badly in 7th grade, she pulled out of her middle school and switched to a home school program.

110210_demi_lovato_ellen_video3As we first reported, Lovato just quit her international concert tour with the Jonas Brothers ... and admitted herself into a treatment center for "emotional and physical issues."

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