TeLL me why??

Why I do love some one who doesn't love me in return?
Why do I cry over some one who didn't hurt me?
Why do I always think about him , if he never thought about me?
Why do I always wait for him , if he have never waited for me?
Why do I see him , but he doesn't see me..??

TELL ME WHY??

AM I WRONG??

even he doesn't know..!