What's the name of this romance novel?

I'm looking for the title of a romance novel I read back in 1998, involving a young woman who grew up thinking she had an inheritance from her father and got sent to a prestigious academy where she met a young man named Preston and almost wed him. She later found out that the man who became her guardian post her father's death was the one who supported her going through the academy and her adolescence and she wound up with her guardian instead at the end.
Asked Oct 27, 2014

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