My ex-boyfriend sent me a message and I called him back. What do you mean he didn't call me back?

There may be many reasons why your ex-boyfriend sent you a message and you replied to him, but he didn't reply to you again. First of all, he may have tried to repair your relationship, but he is not sure how to continue. He may think that your reply is a hint that you are willing to start over with him. However, he may not be sure how to continue, or worry about whether you don't want to be with him anymore.

Besides, he may just want to know your recent situation, or he may need your help with something. In this case, he may want you to reply again in order to continue the conversation.

However, the last possibility is that he may no longer be interested in you, he just wants to know your recent situation. In this case, he may not reply to your message.

The specific situation needs you to analyze according to your history and relationship. If you are troubled that he doesn't reply to your message, I suggest asking him directly why.