I told you the evidence. The facts are that Bill O. has admitted to an affair, which to most people means they were carrying on romantically and secretly behind the backs of their spouses. Bill O. further details the break-up and his conversations with Shipman regarding same. Again, to most people, breaking up means two people who had a romantic or dating relationship have gone their separate ways. Finally, Bill O.'s ex-mother-in-law initally told the press that Lisa had broken her daughter's heart. To most people, that would mean that Lisa became a rival of Bill O.'s wife for his affections, and Lisa won that round.
The pilot admits to a romantic relationship with a married woman and mother of small children.
He has cheated those children of an intact family because he preferred to scratch his itch instead of doing the manly thing and telling the married woman to go home to her kids and leave him alone.
I don't care if she offered herself naked on a gold plate, real men don't do other men's wives.
That makes him a cheat.