Send the wrong text message to your ex.

If you sent a blessing to your predecessor, but later found yourself regretting it, you can consider replying him/her with a message telling him/her that you sent it in error. This is an acceptable way, because you can express your apologies without causing too much trouble to your predecessor.

However, you should also consider the feelings of your predecessor. If he/she doesn't receive your blessing, then your message may be meaningless. Therefore, you should carefully consider your decision before sending a message.

Generally speaking, you should be respectful, honest and considerate when communicating with your predecessor. Although your relationship is over, you should still respect his/her feelings.