What does the WeChat black screen mean?

If you are hacked by the other party's WeChat, when you send the message again, it will be displayed as "Message sent, but rejected by the other party", and there is an obvious red exclamation mark on the left side of the message, which proves that your message was not sent.

Operating version: Wechat 8.0.3 1

Since you have been blacked out by the other party, it means that ta doesn't want to talk to you. If you are true friends, I suggest you calm down for a few days, try to find another opportunity to communicate and try to find out your own reasons, so as to get along more harmoniously.