What does it mean when a guy you've been dating almost a year tells you he can't call you before bed when he's home visiting?

So boyfriend of 9 months tells me he can't call me to say goodnight while he's home visiting. And he takes forever to text me back and never answers my calls or calls me back. Once in a while he'll call me in the morning.
What does it mean when a guy you've been dating almost a year tells you he can't call you before bed when he's home visiting?
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