I'm in love with my best friend's fiance

Im in love with my best friend's fiance. Im very close with both of them and due to be their best man. I just cant stop thinking about her. How do I repress these feelings?

probally be best if you stayed away for awhile and I wouldn't attend the wedding.

You should tell her how you feel. Do not Keep your feelings inside. You never know how she may feel. Of course do not put the moves on her but tell her in private and if nothing happens of it then let it go.