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Well, this is kind of vague. When is this? If this is in the beginning of the book, usually when people get married, if you are nervous you have "cold feet" and I believe that is what he means.

Hope this helps :)

well this was before the wedding I believe,

and theres a saying about people getting "cold feet"

meaning not going through with the wedding,

he was asking her if she was sure about getting married

and becoming a vampire.

He was asking if she had cold feet

refering to the wedding term when people have second thoughts about getting married.

He, erm, wanted to know what was going on with her feet.