How do I get my number out of my dad's iMessage options?

I

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I just bought a new iPhone 6 and as soon as I turned on iMessage, my dad got a notification saying he was opening up a new imessage of a new iPhone (mine). And in his message settings, he has an option that is titled "text message fowarding" and under that there's my number. I'm wondering how to get my number off of his phone so he can't see my messages?
 

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