Hi, I think with technology taking leap, long distance is not as difficult as it was a decade back when there was no possibility of anything else than weekly calls to your lover or may be daily calls but always with a thought that it will going to cost me a hell. Now, with video calling available for free and instant messaging where you can be in touch with that person all the time, I think only constraint that is there is physical intimacy. When my boyfriend was studying in Germany and I was in India, we used to be in constant touch with each other through instant messaging and every day we would do video calling and it helped a lot in keeping us sane without each other.
Keep the communication lines open. Make time for call para you'll be able to keep the fire burning.
thanks