Chatting with girls always happens when I send her a message or two and she suddenly doesn't reply. What does she mean? What should I do?

She often doesn't answer you suddenly, which means she doesn't want to talk to you and thinks you have nothing in common. The point is that she is not interested in you, but you like her a little, so I advise you to give up as soon as possible. I'm a girl. I've done this before. For people who are not interested but have been pestering me to send me messages from time to time, I usually just reply politely, and then I won't reply again.