Frustration.

   
I never envisioned myself missing you this much. Of all people, I thought our conversations would dull with time.

 That would have been so much easier.

 It's become the opposite. With each passing day, and with every written letter, the words grow deeper; the weight of the envelope in my hands become heavier and heavier.

There's a lot I could say, but to put it simply, 

Hurry home.