OK so I will try to make this as short as possible and easy to understand:
My soon to be hubby's Best Man recently divorced from a mutual friend. I still keep in contact with her and before the divorce she was invited to the wedding, and still is. They are in the midst of a nasty divorce, and the make matters worse one of the reasons for that is the other woman our BM was cheating on his wife with.....they are now officially a couple. I know what Etiquette states that b/c the BM is now in a "serious" relationship i should invite his new girlfriend, but to be honest I DONT WANT TO. I know it sounds childish but I would prefer the least amount of drama that day. The former wife and the new girlfriend in the same room for hours does not sound like a good idea to me. I will say now that I will not UN-invite my friend, and of-course the Best Man will be at the wedding too.
Both former husband and wife know the other is going and when I sent them the invitation i made sure to only put their names so neither would have the option to bring a +1.
Talking to my fiance he is totally understanding and agrees but doesn't want to get into the middle, and I can understand his side. I just could use some advice from my fellow brides.