Who hasn’t sent SMS mistakenly to the wrong person at least for once? I bet its about everybody. And then its the regret, and to avoid such problem a new Cydia tweak can be your savior: confirmSMS. It is a new tweak that lets you confirm before sending the SMS, there isn’t much to do but simply install and use it. Once you install it, it will pop up in your dialogue box confirming every SMS of yours.
ConfirmSMS is available in the BigBoss repo for free.