I called my ex-girlfriend, she answered, exchanged a few pleasantries, and then I sent her a text message to apologize, but she didn't call me back. What do you mean? I broke up with her.

Broke up, but my ex-girlfriend might not mind. If you call, she can just answer a few words casually. Of course, if you break up first, the girl will be angry, so she may not accept your apology, and it is normal to ignore you. Another is that the girlhood has not disappeared. You can talk to her. If there is no chance, then give up. According to you, your personality is not suitable.