Now that you are officially in a long distance relationship, a lot of adjustments will have to be made. So many drama moments! I remember the day before the first time I left, he was driving me around the city and suddenly he just stopped the car. We both did not say anything until after a few seconds, we just cried really hard. For the first time, I saw him cry that hard. Haha. But actually, even up to now, I'd still really cry every time I leave. I hate goodbyes eh.
So here is a poem that might express what you are feeling now. (got this through google.com)