Waiting for EVIDENCE is a reasonable person's reaction to an "anonymous source" saying that a married person fooled around with someone else years ago, with no checking of credibility of the facts.
Sounds like you have a classic woman-hating syndrome.
There is no evidence whatsoever that Maria Shriver was ever unfaithful to her husband. None. While Guvenator has the evidence of his walking around. Besides it being common knowledge he's always been a philanderer. There have been numerous complaints against him over the years by women.
I could never get past her pointy chin... gives me the willies, lol...