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The past
This point applies only to the lovely couple. No matter how much understanding you share with your partner but your past can become a serious issue anytime. Seeing a fiancé’s ex at the wedding can lead to firecrackers between the couple! The solution here is to just grow up and accept that the past is over and done with. If your partner is still friends with his/her ex then clearly convey your feeling to them about inviting the 'ex' to the wedding.
Whatever problems you face at your wedding, just stay calm and deal with all the issues as tactfully as possible!