This is what makes LDR's so hard.
I know in my case my Sir travels a lot for His job, works extremely long hours and sometimes is just exhausted when He gets back to His hotel room. Sometimes its hard for Him to even send me an email. And I think it only takes a minute just to tell me "hi'.
But He also is very good about telling me that He will be traveling and may not be in touch for a few days too. Sometimes with no Internet or cell service. I still worry though.
When I haven't heard from Him in a few days, my mind goes crazy and I worry. Only imagining things that would keep Him from getting in touch.
But every time my worries were unfounded and everything was ok.
Keep the faith and go with your gut its always right.
Best of luck to you.