You think being in a relationship separated by a few states is difficult? Try countries, or an entire ocean.
A simple trip to visit your loved one could cost you an entire paycheck.
And crazy time differences mean that in order to communicate, one of you is going to have a seriously abnormal sleep schedule.
Not to mention having to answer the ever-popular million dollar question: "How are you two going to make it work?"
These are both totally acceptable responses, BTW.