An insider for L&S claims Pitt recently caught Jolie reading his e-mail. The source adds, "Brad says Angelina is so insecure, he's caught her going through his pockets on more than one occasion."

Angelina feels totally justified in her nosiness, though. Says the snitch, "She turns everything on its head and tries to make Brad the villain. She accuses him of still being hung up on Jennifer Aniston and of not wanting Angie to see the e-mails he's sending to his ex-wife."

At first, Pitt was infuriated by Jolie's spying. The source says he called his sister and "told her, 'I'm done with Angie. I can't put up with this anymore." Eventually, though, Pitt reconsidered his position. Instead, "Brad asked Angie to consider making their relationship an open one," said a source close to Jolie. "His idea is that when they're apart, he can be with other women and she can be with other people."

With Angelina's wild past and her history for "taking lovers," it wouldn't be surprising if she agreed to Brad's proposal.