Whatever you do, don’t put unmarried partner because that is not what you are. You and your partner do not meet the definition of Unmarried Partners, so putting that would be like ticking that you are Married when you aren’t.
I don’t know for sure, but I would probably put single on the first page and fiancé on the next page.
It was easier with the old form because I think you could just tick Other and then write in Fiancé.
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