Yeah, you two just didn't work out, weren't compatible or whatever and end on relatively good terms, it's cool.
She cheats on you, keys your car or does some stalker shit, then alls fair.
Man law #298
If we ended on any note other that her destroying my property, credit, or defaming my character, then I would not. Even if she cheats, says a lie, but not one that could get me in trouble, or any thing other that the aforementioned, I still would not. What kind of integrity would I have if I did an unjustified foul act?