People reported that Jolie said she never had intentions of breaking up Pitt's marriage to actress Jennifer Aniston.
In the January issue of Vogue, Jolie reportedly speaks about how a relationship grew between the two of them during the 2003 filming.
"Anything we had to do with each other, we just found a lot of joy in it together and a lot of real teamwork," Jolie said. "We just became kind of a pair."
Jolie said the clinching moment came when her 5-year-old son, Maddox, called Pitt "dad."
Excerpts of Jolie's interview were published in the New York Post.
Jolie and Pitt do not plan to marry until all couples can legally marry, People reported.