why am I always the one...

Who is checking up on others?
I was thinking about how I genuinely miss people when they are not around. I facebook and text, not even always getting a response, and does anyone do that for me? No. I never get just a hi. How have u been. I haven't seen you. I missed you. Nada. This really hit me today. I guess this is mostly work related but I have 2 friends I love dearly who come to my desk to see me and talk to me on a fairly regular basis. Not that the universe centers around me... My complaint is in regards to myself... why the hell do I care so much about people who could obviously do without my presence?
Just wondering... Maybe its my imagination. Maybe not.