We are going to a wedding tomorrow. One of our friends isn't invited. She has been very close friends with the groom for about 16 years. To be fair, they did end up in bed once, many years ago, but that is well and truly in the past. She is entirely not in any way a threat (to anyone, DH and her have been close in the past too, she has since become one of my closest friends). All* of the others from their group of friends are going. Even people she introduced him to recently, who neither bride nor groom know well. It is a big wedding, so not a numbers thing.
They really are good friends. They live near each other, and see each other at least once a week, socially. They've talked at length about the wedding, and she gets on well with the bride.
Either it's the sex thing or an honest mistake. Either way, she's desperately hurt, and I'd really like to know what it's all about. Would it be unreasonable to ask him?