What should I do if I send a text message to a good friend or a woman by mistake? It was originally sent to my girlfriend!

1. Wait for the other party's reaction, if you want to develop a second one.

2. immediately clarify that this is a general practice, and I personally generally don't need it. Instead, send another message that is obviously addressed to your current wife, or just call your wife by her name, so that she will realize that you sent it wrong, and then she'd better explain it.