Funny, she seems to think Arnold was the only one with "secrets...."
mothers often have no others activities than working, taking care of kids and doing the dishes and laundry...(and real men and fathers often dont have no others activities than working, getting money, and sharing their knowledges -which increases everyone odds of survival- with kids, wife) I doubt she has many secrets he could reveal; if he s an ass he ll say she was bad in bed... but even this cannot be an argument when you lived with someone for 30 years... it's going to be nasty.
I also think he never loved her in the firstplace. She was just a handy substitute of a mother figure and he loved being the fake nice muscle guy of the family. He was just a liar , a cheater and couldnt do much anything else than flex his fake muscles tho. Every few serious job/position he had he was supported by other people doing everything for him.
I guess his own father cheated on his mother more than once. I guess arnold always treated mariah like shit, telling her she was ugly, fat, compared to his own physical beauty, that she didnt deserve being with him etc, she has the typical low self esteem personnality these kind of predators like arnold can detect easily. But he s gone too far. She has every right to say he betrayed her.
All in all his life is crumbling before his eyes and everything he has fought for is now tainted by the ugly mexican maid story. This is the only thing people will remeber ultimately of him. I dont think this is what he predicted.