When my fiance and i got engaged 6 months ago, we immediately asked our closest friends and family to be in the wedding party. My fiance asked his best friends from high school (we're 20 and 21 so we're still very close with them) but one particular friend has since branched off, moved away, and basically fallen off the face of the earth. Our wedding isn't for another year and a half but is it ok for him to ask someone else to replace the other friend? And if he can, do we tell the old friend or just not bother?