I'll will try to make this as short and painless as possible. FI used to be BFF with this girl for several years before I even met him. When we started dating, I wasn't overly fond of her, but I kept my mouth shut. We hung out with her pretty often and I got over my initial feelings. When we got engaged, she got kind of jealous, but not in a "I want him and you have him" kind of way, it was more of a I was taking up all of his time and she was used to him being at her beck and call. She really was a snot about it, but me and my not so nice mouth didn't help the situation.
They stopped talking and that lasted a little over a year. About a month ago, she requested him on FB and he mentioned it to me. I told him to do whatever made him happy because I wasn't going to choose his friends. She sent me a message saying that she really missed him and she didn't send him the request to start drama... she just wanted to try to reconnect with someone who was like a brother to her.
I overheard FI tell a friend that he wanted to invite ex-bff to the wedding, but he didn't want to say anything to me for fear that I would be upset. Should I say something to him? Should I invite her myself? Should I ignore the whole situation?