My nokia 630 has all my husbands iphone contacts on how do I get rid of them?

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Hi, I have just purchased a Nokia 630, I have set it up. My husband and I both use the same email address as we both want to view our emails from our phones. My husband has an iphone 5 and somehow his contacts have shown up on my new Nokia 630. If I delete a contact it automatically deletes off his iphone too. Please can someone help me to get rid of his contacts from my phone without deleting them from his? Many thanks!