Sooo I know if a person is in a relationship you invite their SO. Additionally a verbal invite is just as valid as a paper one.
Here is my issue. I verbally invited my friend of ten years and his gf of three months. I never met her up until two weeks ago during a dinner party that i hosted. My friend's SO has severe trust issues and during our initial meeting she was extremely drunk and stand offish. At the end of dinner she accused me of sleeping with my friend. I was shocked and my FI tried to come to my defense. She then threatened to beat me up and came lunging at me. My friend dragged her off and apologized profusely on her behalf a few days later.
As I'm addressing the invites now, I am unsure if I should invite the SO especially after the fact that she lunged at me. Etiquette-wise would it be wrong to exclude her from the invite, or should I follow etiquette and invite both as a unit because of the verbal invitation?