Reply To: Classics and Beyond: Ki Seitzei – The Pledge of a Lifetime

It says כמשוש חתן על כלה ישיש עליך אלקיך, like a groom rejoices over the bride Hashem should rejoice over you. It does not say husband on wife because we want that Hashem should see on us a constant renewal and rejoicing in our service to Him, so should the husband see in his wife that constant renewal and have that joy.