What does it mean if you send a message saying that you broke up ~ but your boyfriend doesn't call back ~ or call ~?

I think there are the following situations:

First, he didn't see the text message at all.

Second, break up and break up. He doesn't care, so he's too lazy to reply to text messages.

Third, it is possible that he is thinking about how to tell you and how to save it.

Fourth, you often break up with him. He is used to it and is too lazy to return.

He hopes that the other party can calm down before making a decision.