OK, you are having a bad few days. Just remember that a lot of public posing doesn't make a great relationship. They may or may not be happy. She is a woman who is prepared to live with a cheating man. How does she ever know that he won't do it again when another nice bright shiny toy comes along.
He has to live with this bimbette and himself. You have class and dignity. That feels right now, like hard fare, but it is nourishing. Antonia, eventually all of this falls apart.
By which time you will be one strong independent lady, poking at the wreckage with the toe of her elegant shoe.
We do survive and prosper. They may appear to win individual 'battles', but we win the war. I use military terminology because at time it is like a battle.