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Friends fear Jennifer Aniston is on the verge of a nervous breakdown as she struggles to come to grips with life after Brad Pitt.

Jen has been withdrawing from many of her pals, collapsing into crying fits and working herself to exhaustion, a source close to the star revealed.

Our latest issue discloses that Jen’ s being stressed by stories about Brad’s relationship with Angelina Jolie, tells how Jen “freaked out” while house-hunting in Malibu … and more.