What do you mean, he won't answer my calls or return my text messages?

Think about it. Are there any problems between you these days?

Or he has no feelings for you and wants to break up with you.

Either he was in trouble recently and didn't want to tell you.

There are many reasons, but you must put them in their environment.

Don't analyze the problem one-sidedly, otherwise it will only backfire.

Give each other some time to calm down.

Don't give him any more news.

See how he will react without you.

Consider it a test.