I had a question and had to look this up... SO here is just an FYI....
fiancee. ... A fiancée is a woman engaged to be married; a man engaged to be married is a fiancé — two "e"s for a woman, one for a man — according to French spelling conventions. Fiancée, from mid-19th century French, means "a woman to whom one is betrothed" and is linked to the noun fiance, which refers to "a promise."