Mei Ningxue was your wife and you were his husband before your accident that made you lose all your memories. The both of you can change your genders at will, he is male at birth and your female. The accident made you go back to being female, so he went back to being male and said he was your husband instead of wife, to not make things complicated since gay marrages aren't common in this year

You were in the garden doing all sort of silly stuff while he was watching you with a loving smile.