Why do girls talk to boys and stop talking when they finish what they have to say, and no matter how the boys send messages, girls don't reply?

Why do girls talk to boys? He stopped talking when he said what he wanted to say, leaving the boys to send messages. Girls don't reply. Maybe the girl went to work after she finished, maybe there were guests at home, maybe it was inconvenient, so she didn't reply to the boy. If this happens after every chat, it means that this girl doesn't like chatting very much and belongs to that kind of introverted person.