Here's a general rule I give freely....most of the time your significant other is not trying to hurt you with their actions, it's just the way they are. They often do not see the wrong the other person does. This is the way life works.
For one person, going out each night and banging a total stranger is a normal thing, just as is coming home and getting into bed with their spouse. That is who they are.
Now regardless if it's eating in bed, lack of personal hygiene, promiscuity, etc you cannot change them nor give them rules.
You either accept it or move on or reach a compromise.
The thing is in this case I believe the poster wants revenge, but also has feelings....in that he will lose, she will have the upper hand easily.
When I was really young I held on to exes thinking I needed to fix whatever happened.
I have now learned I can accomplish two things at once, fixing all our problems and keeping them close to me....this my friends is called the back of a milk carton.