how would you feel if you're in this situation?

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My friends and I will be coordinating a wedding reception for a former officemate of my friend. It is normal for every bride to want their wedding to be perfect but on our first meeting I also learned that she's seeing another man besides her fiance. Now my best friend and I don't like what she's doing but we reminded ourselves that our relationship is purely business only, but the situation is different with our other friend since she's a bridemaid to the wedding. I don't like it when people cheat behind their partner's backs much more if they will be getting married soon. Yet since we only met for their upcoming wedding & the relationship is purely business then what the bride-to-be is doing is not really my concern, but I really feel sorry for the groom-to-be. How would you feel if you know someone who is cheating on his/her fiance?