But I completely agree.
Always comes through with the vivid descriptions.
Now if she is inviting you to the wedding to try and make you change her mind...Then you have every right to say 'no'. A person who is on the verge of getting married and is still having doubts with their ex is a really big red flag.
I'd avoid the drama and move on.
When I attended my ex's wedding, we were past that point in our lives and we happily moved on. Hell, I forgot to mention she was even my wife's Matron of Honor lol.