It’s an odd phenomenon, at least in my mind.
One of the best ways to know that someone has wormed their way into my life in a significant way (usually some combination of sexually, emotionally, and intellectually–two of three is typical) is that I find myself missing them. It’s rarely at any obvious time–it’s usually just something that washes over me when my mind is not otherwise occupied. Or when I have a dream about them. Or if they come up in my News Feed.
Just going to put this out in the universe and see what pops up: if you think you might be someone I’m missing, please send me a message–there are more than a couple of you out there.
Purple Penguin 
I always love hearing from you, V. Would you like a postcard from Korea?
Yes I would. Do you have my current address at the apartment?
I’ve got it around here somewhere, but I can’t find it at the moment. Could you e-mail it to me.
Heh. I’ve got your address in Italy, In Issaquah, and at Camp Killoqua handy, but your address in Bellingham seems to elude me.