Send a text message to a girl you like, and she suddenly doesn't reply.

Maybe your question made her feel a little abrupt. As a girl, you should generally keep a reserved attitude. Keep working hard, she will feel whether you are sincere to him or not. Don't contact her by SMS every time, otherwise it will be embarrassing to meet. Meet and chat as much as possible. Give her a small gift once in a while, or give her a surprise, and you will succeed. Don't chase girls too hard, but keep a degree. Just like cooking fish with warm fire, that's the most fragrant. I wish you success!