The former governor of California announced his split from wife Maria Shriver earlier this week, after 25 years of marriage.
Former child actress Gigi Goyette, with whom Schwarzenegger denies being unfaithful, told The Mirror: "I don't think I had anything to do with the break-up of his marriage. There were so many other women. About 13 have come out of the woodwork.
"Maria Shriver is a Kennedy [her mother was John F Kennedy's sister] so I think that, like a good Kennedy, she decided to ignore what was happening."
Goyette said that she first slept with the actor in 1975 when she was 16, before embarking on a fling with him in 1989 - three years after his marriage to Shriver.
He has faced claims that he cheated with other women in the past, including an apparent fling with Total Recall co-star Rachel Ticotin during the making of the film in 1990.
A friend of Shriver's said: "She'd been faced with these tales for 25 years of marriage. You can't imagine what that must be like."
Schwarzenegger has insisted that he still loves Shriver "very much".