What does it mean that the boy who secretly loves you suddenly disappears and doesn't return the message?

It means that he just has a good impression on you, and you like him only unilaterally. He pays more attention to playing games, fearing that replying to your message will affect his game score, and his spirit is focused on playing games, so he has no time to reply to your message, and the notification message is blocked. Even if you send him a lot of messages, he can't see it, but to be honest, this boy can play games, which is human nature. But you can't indulge in it. It's no use getting it out. There is no need to love such a boy. He just likes games, but he has no dedication to his work, which is a hidden danger to your future happiness. If you think it's nothing to play games, just call the boy directly.