Boyfriend is on business trip and I barely hear from him?

He is gone for two weeks in NYC. I've been leaving him alone because I know he's busy, however, I know he's not THAT busy. He'll send me a text or two when he's at work in the morning but at night there is only silence.

I don't expect a call every evening or even a long call but a check in every few nights would be nice...

I called him only once this whole time and he didn't pick up and didn't call me back.

Should I be worried about what he's doing?
Boyfriend is on business trip and I barely hear from him?
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