Priscilla Presley has said that she left Elvis because she needed to find out what the world was like. She didn't know who she was, and she got to a place where she wanted a life of her own. The two of them had been leading separate lives.
Elvis had several affairs with other women, and there was much publicity about a secret romance between Elvis and Ann Margaret. Priscilla also had two affairs of her own during the marriage. Priscilla also had to go to great lengths to make Elvis happy. Elvis never saw her once without make-up.