There was a story where the bride had been secretly messaging a guy she met online before the wedding. At the wedding reception, she slipped away to meet him briefly. This is a form of cheating that can lead to the destruction of the marriage even before it has really started. Weddings are supposed to be about commitment, and cheating goes against that.
In sex stories about wedding cheating, the characters often face social consequences too. Their families and friends may find out, and they could be ostracized or judged harshly. The cheater might also feel guilty and struggle with their own self - identity. For example, if the groom cheats at the wedding, the bride may be so heartbroken that she becomes a completely different person, withdrawn and distrustful of others in future relationships. And the groom, if he realizes his mistake, has to live with the guilt and the knowledge that he has ruined something special.
One possible consequence is the breakdown of the marriage. The betrayed spouse may feel deeply hurt and decide to end the relationship immediately. It can also lead to a loss of trust not only between the couple but also among family and friends. For example, if the cheating is exposed during the wedding reception, it would cause a huge scandal and embarrassment for everyone involved.
Open and honest communication is key. The person who cheated needs to be completely truthful about what happened and why. For example, they might have to confess any underlying issues in the relationship that led them to cheat.