There is actually something worse than cheating... worse than your long-term spouse sleeping with someone else.
Finding out by the police that your long-term spouse has contracted a random person to kill you so they can collect your money, lied to everyone how he die and fake tears at your funeral.
It's obvious cheating is bad but I wouldn't call it the worst thing you can do to your partner. The worst thing would be finding out your partner wanted you dead.
Updates
1 mo
A person that only cheated but would've never gone that far as to kill you would be better than someone that never cheated on you but wanted you dead, wanted your money.
