Sweetheart you are right about it will hurt him not you. You don't seem to even be sorry for what you did, it's a joke to you! Now I can appreciate the humor in the area code remark, but it loses something when your boyfriend is the butt of that joke. My advice: don't tell him, do him a real favor and break up with him before you hurt him again and again. If you made a mistake and were truly sorry for what you did, I'd say try to make it up to him and move on. You ain't sorry, it's a joke to you. Are you trying to find somebody to help you rationalize your actions here? Good luck. I don't know the guy but he deserves better than you can give at this point in your life. Set him free and give him a chance to find some one who cares about him. You don't.