Iphone saves old numbers under same contact?

I have an iphone4 and whenever an old contact gives me their new number i replace it. However, when i go to send that person a message a drop down appears with their old number included. How can i get it to stop remembering the old number bc if they change their number often i could have several to choose from and may not remember which one is the new one

Added (1). So how do keep that from happening?

Yeah and its pretty cool but i don't have one but i know how

Wow, Tyler, that is one of the most helpful things I ever heard.

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