I had 2 friends who’s lifelong friendship ended over a bridal party. The groom had 5 groomsmen, 3 family members and 2 friends. Those friends happened to be met through his fiancé, and they were married to 2 friends of the bride to be (all in the same friend circle). She also had 3 sisters to include, so 5 on each side. The bride to be was the maid of honor in the life long friend’s wedding. So in this friend circle, 2 were asked to be in the wedding party, 3 were not, even though the bride to be was in all of our wedding parties. The one friend not asked went to the wedding, and then never spoke to her lifelong friend again.
I wasn’t asked to be in the wedding, I was fine with it. For mine, I asked my sister, one of DH’s sisters, one niece for a junior bridesmaid, one niece as a flower girl, one college friend, one high school friend. If I chose all female family, college friends and high school friends it would’ve been insane. DH had 5 very close lifelong friends, so that was easy.