I've been in that situation before.... take my advice with a grain of salt since my starter marriage was legally dissolved 2 years ago.
If you're going to talk, make sure it's just before you go to sleep. It's easier that way. Along those lines, never go to bed angry at each other; you've already seen how fun the distance can be, so don't make it any worse by adding animosity to the mix. Get family plan cell phones and/or unlimited mobile to mobile, and let him know you need to talk more. Email. Send love notes. Flowers (for you). Porn (for him, and you). Plan a vacation together. Try to be with each other during the holidays. It may not always work, but at least make sure the other one knows you're thinking of them
Pretty soon the two of you will have to make a choice: Career, or marriage? I know precisely one couple (out of 6 I know) who has made a LDR work longer than a year and a half before calling it quits. Don't play the odds because they're not in your favor.