He, who always remember

There is one person i knew since elementary days and every special occasion in my life he always remember aside from my family and friends. We do not communicate with each other more often, we don't text or chat ,he's not a friend on my Facebook page nor a follower on my twitter account but still he finds a way to greet mo or ask me if i'm okay even if he never received any reply. Sometimes, i am irritated because of his consistent persistence but he doesn't care. though a part of me is happy because despite of my i-don't-care attitude he still remember me.