yea, long distance relationships are really exhausting to keep up. And it's hard to comfort a person (with hugs, etc.) when they are so far away from you.
but... i guess you can try: 1. having regular chats on AIM, 2. giving each other personal space when needed, 3. send each other digicam/webcam pics or have a live webchat with him, 4. talk on the phone once in a while, 5. mail each other little gifts to show that you still care every now and then, 6. be loyal!, 7. Schedule monthly visits (if you're not moving too far away).
take care~