Why do I especially want my girlfriend to return my message? Am I immature? I waited for her to reply to my message as soon as I sent WeChat, but I didn't reply for a long time.

You love your girlfriend too much. Your girlfriend obviously doesn't love you much. From your description, I feel that you are dispensable to her. No matter who is active or passive in this relationship, you should send her a message, even if it is polite, but she didn't. It's obvious that she doesn't care about you, and she will break up if she can't. In this relationship, you are tired of taking the initiative to find someone who loves you. Know how to choose