I'm upset with my fiance for getting drunk and making out with her friend in front of all her coworkers at a going away party for her boss
Did you confront her about it?
She fucking embarrassed me dude.
Her behavior is unacceptable. It is wrong what she did to you, you should confront her about the behavior.
I'm going to go out of my way to get back at her.
Revenge isn't going to help anything. Just voice your displeasure with her and go from there.