I am sorry to hear about your struggles. I don't know how I feel about if my MOH or BMs bailed, but I tell you I will not be shocked if they do. I think sometimes we confuse a true friendship with people who we hangout all the time and think they are true friends. I have a few very close friends but they are very self-centered and selfish, I look pass that. Even one of my best guy friend said he could not believe that I didn't ask him to be my BM....like seriously? get over yourself! You are lucky that you got invited!
I had people asking me to change my date because it did not work with their schedules or gf or bf could not make, I said N-O. I always say if there is a will, there is a way. I am planning to get married ones to a man I love, the most important person that has to be beside me is him. The rest of people will come and go into and out of our lives...So have a drink and seek support in a arms of your man...
Good luck with the rest of the planning. One day you will look back at it and remember how happy you were marrying a man of your dreams in paradise with blue water and pillow soft white sand...We are so lucky and fortunate that we could do that:)