The ex-girlfriend is a car-scrapping person. Five months after breaking up, she suddenly sent me a message today. I asked her what happened, but she hasn't returned my message. Don't you understand?

Maybe you sent the wrong message by mistake. You ask me, and I don't know how to answer you, so I won't reply to you. If she changes her mind and wants to make up with you, then she will definitely reply to you. If she doesn't reply, it means she really put you down. Stop asking her what's wrong. If something really happens, she will tell you on her own initiative.