What should I do regarding my wife who committed adultery and repented, and wants to seek Allah's forgiveness, and I love her and wish to conceal her sin, but I suffer greatly from remembering the sight of another man seeing her nakedness and committing adultery with her?

A woman does not fall into indecency except due to her husband's shortcomings and negligence in her care. If the husband fears his Lord and takes care of his wife in a way that rectifies her religious and worldly affairs, she would be further from temptations. As long as the wife has repented, it is obligatory to conceal her, and it is preferable to keep her. What you feel of jealousy and pain is natural and consistent with human nature, so seek Allah's help and ask Him to avert the cunning of human and jinn devils from you and your family.