The popular "Friends" actress Jennifer Aniston will never know if her estranged husband Brad Pitt cheated on her with Angelina Jolie.

According to Vanity Fair magazine, Aniston in an interview said she believes Pitt's position that there was nothing going on between him and Jolie before he and Aniston ended their marriage in January.

But she says she began to have suspicions only after photographs started emerging of Pitt and Jolie spending time together with Jolie's son Maddox.

The journalist who interviewed Aniston said, "She said to me 'I'll never really know.'"