Mel has repeated and publicly referred to his wife as a saint and stated often that she is the better person in the marriage.
Stories of Mel’s indiscretions are common fodder. See if you can find similar stories of Mrs. Gibson’s misbehavior, overspending, drunken scenes, etc.
I asked a question and it has not been answered. The poster made a supposition that they cannot prove and the onus is on them.
I have grown bored with waiting and don’t believe that she is “steak” based on the lack of an answer.