How to unblock a person on iPhone 5?

Me and my boyfriend were getting in a argument and I got a message saying if I wanted to stop getting texts from him to reply stop. I thought he was the one who sent it but it wasn't and I sent stop. I want to unblock him because I miss him! Please tell me how!

IChat>Preferences>Accounts>Security click "Allow people in my Buddy List" or "Allow anyone", depending on which you prefer, to unblock your friend.

There's no block you can do by sending stop.

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