What should I do if my boyfriend started this new thing where he says he will call me back but doesn't?

Anonymous
He says he will call me back and he does after an hour to 3 hours but I will message him and ask him whats going on? And then fall asleep. And he will call me back after that but won't respond to my text easing my mind or anything about what took him so long. Its late at night and he knows I work. So why wait that long to call me back….

He used to always text me back and clarify things, always stay on the phone with me, and we did both agree to give ourselves some time alone bc we talk so much but he still would text me and let me know
What should I do if my boyfriend started this new thing where he says he will call me back but doesn't?
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