My FI and I both have opposite sex best friends. My best friend is a man who I have known since I was 2 years old who has in the last 4 years came out to me as a gay man. When my FI and I got engaged he automatically knew he was going to be part of the wedding. He asked to be on the grooms side instead of my side to get away from the cliche gay best friend stereotype. My FI has a female best friend who he has known for maybe 10 years. She recently got married and he was a member of the wedding party standing on her side. However, my FI and I decided that she would stand on my side at our wedding since my male friend is standing on his. We have been engaged since December 2008 and have made the decision about this since then. Since December she has made numerous comments about her desire to stand up on the FI side. I take offense to this desire since we have already tackled this issue. I recently wrote her an email about her comments and my desire for her to keep them to herself when I am around since I have become super sensitive to her negativity about our wedding and her role in such. She called immediately to my FI and complained that I was mean in my email. What should I do to remedy this situation before we get married?