Women who party and are neat, structured, etc., may just be in a period of their life where they are having fun and are honest about who they are at that moment. They show (inner) awareness that they may change. Women low on conscientiousness avoid looking that deeply within themselves for fear of what they will find.
Once more organized, self-aware women do enter a commitment, they are much less likely to turn to infidelity. They will lay an ultimatum on the man telling him to meet her needs or be served divorce papers. I have seen such women do this, they are rare and impressive (especially in America - European women seem more assertive about this in my experience).