They also claim that Jen was hoping to have children with Brad Pitt so when he started a family with Angelina Jolie she was very hurt.
"She kept on thinking that should have been me!" a source spilled.
And with her marriage to Justin, they 'barely had anything in common.' After the split Justin 'became petty'.
"She ready to take on new challenges" says the insider "and she wants to tell the world the truth," they added.