The couple, who got together in 2005, got engaged in 2012.
"Angie's insanely devoted to Brad. She fell for him the minute they met. And he loves the way she is into him. Brad says he proposed to Angelina for the kids, but that's not quite true," showbizspy.com quoted a source as saying.
"They had hardly any time for each other, with him promoting a string of films while she spent 10 months working 18-hour days on 'In the Land of Blood and Honey'. He was convinced she was pulling away from him and worried that she wouldn't need him anymore. He felt marriage would give her a reason to stay.
"She is very controlling of Brad, his wardrobe and everything. He does what she says...," said another source.