If I know you don't, then why do I love you?

If i know u don't, then why do I love you?
If I know you don't, then why do i care?
If I know You can't, then why still I hope?
If i know you can't, then why still i hope?
When u hold my hand why hopes come back?
When you touch my face why pain is gone?
When u go away why i feel sad?
When u say u don't then why do i feel?
If it is not love then what is this called?