The girl I have a crush on, we used to text and chat every night for months, and now she won't return my messages. What happened?

Don't ask why, it doesn't matter until you have a successful relationship (at least for her). If you really like her, maybe this is a chance, or the last chance.

You keep texting her, but you don't ask her "why don't you reply" and so on. You should tell her sincerely how you used to chat with her, reply to messages, wait for a reply ... and how your feelings have changed so far. It can't be done in one or two sentences, and it's better to be 100-300 words or more. If she still doesn't answer, you should pay attention to her from the external environment and find out if she has had contact with others. Is the mobile phone in arrears?

If neither, then you have a chance! If she sees your long-winded message, but still doesn't reply, you can call her directly and listen to the tone of her first sentence, 1, heavy, low-key and slow: it means that she has considered enough and you have hope; 2. Excited or helpless tone: It means that there are other men who haven't let go, and you can continue to touch her; 3. Easy and friendly tone: It means that I don't take you seriously, or that I don't know anything; 4, serious, serious tone: the famous flower is taken, you should consider whether to "grab" it back; 5, very annoying, very grumpy tone: She always thought you were a good friend, and now it is possible that you are no longer friends; 6, very serious, very calm tone: everyone has always been a good friend, and will be a good friend in the future, you wait for the opportunity; 7. Don't answer the phone: It means you are still considering it. Don't worry. Call her again in a couple of days to explain your thoughts. Maybe you don't want to see you at all (maybe).

This is just my personal opinion, which may not represent all situations. I wish you lovers all get married.