I'm going to leave my fiancee at the altar
Why would you ever leave your fiancee at the altar?
Well, she caught me cheating on her and I've been with a lot of other women in the past.
It's really terrible to stand someone up, especially your fiancee at your wedding. You need to sort things out with her before even trying to get married.
She brought all this on herself, now we all know she's a bitch.
Standing your fiancee up at the altar and also cheating on them just seems like a double whammy. You are better off not going through with the wedding at this point.