My Fiancée and I are four months away from the wedding. I am completely stressed out because of all the interpersonal drama that is going on. The biggest issue is that he has decided to have his EX WIFE be his "best man". He says it's because she is still one of his closest friends. The ex makes his family uncomfortable. My FMIL has disclosed to me that she was never truly part of the family and they don't particularly like her. The ex makes me uncomfortable because she doesn't really support our getting married and has stated such to me and him (yes, we have contact with her regularly).
I told him about my fears that our wedding day will be overshadowed by her presence but he keeps saying that he should be allowed to choose his best man freely regardless of how the situation will make anyone else feel. He did this last holiday when he brought both of us to a family get together. It was tense and uncomfortable. He said it was his family's problem not his. He also feels I am putting the feelings of his family above his. I'm not. I just don't want to look back on my wedding and remember it as being uncomfortable.
Am I being unreasonable?