There's a difference between Maria Callas and AJ, that being that she was always Onassis GF but refused to marry him. He felt that he needed a wife, so he married Jackie, but continued with his shennagians with Maria Callas. Okay, cheating is cheating but at least in this case it was more out in the open and it wasn't like Jackie wasn't aware of that before she married him.
LOL, Elizabeth Taylor was a mess too, and you see how she ended up; alone and in pain. Sadly, Angelina is one of those people who you know is going to end up dead one day.