This kind of situation usually appeared in novels or anime because the two sides of the conversation usually had emotional entanglements, so this sudden indifference and not replying to the message might cause dissatisfaction and anger from the other party. However, in real life, if you suddenly tell a guy that you won't chat with him in the future, he might not be angry because it might be a simple decision and it doesn't necessarily mean that there is any conflict or problem between you. Of course, he might feel disappointed or sad, but that didn't mean he would be angry. If they wanted to avoid this situation, it was best to communicate in advance so that they had enough time to understand and accept each other's decisions. At the same time, you should also maintain respect and understanding. Don't suddenly give the other person the cold shoulder. This may make him feel respected and improve their relationship.