Ooooooh I know that kind of mad. Had it, have it and will continue to have it BUT the secret is not to let it eat at you and blind you. This D anger will not last forever and it may cloud your judgment. You don't want to act on it but you need the emotion to propel you forward. Make good unemotional decisions.
She is a whore and your H a dumb a@#$ but let them wallow in there happiness because it is not real. It has no solid foundation. It is built with deceit and lies. Its only a matter of time.
So you get on with you and making good decisions. Don't drop to his level. By the time it is all over you will be exactly where you need to be and he will be a mess on the floor.