Bridesmaid
Wait, we don’t understand, so your friend who slept with your husband, ended your marriage, and then you remained friends with them? Or did she break up with both her husband and her friend, only to have that unfaithful friend contact her four years later? We are a little confused about what happened here.
But regardless of all the details that are missing from this story, it is really silly to think that her friend would even want her at her third wedding. Three weddings say a lot about the track record of a person, and something tells her the third wedding was with her ex-husband.