Rit, It sounds to me like you are beating yourself up because you think you should have more bad feelings about this than you are actually experiencing. Well, the person you knew was somebody from 10 years ago...and absence does not neccessarily make the heart grow fonder..not after 10 years, anyway! I think your present feeling is appropriate, under the circumstances, IMO.
You can't command feelings, they just happen that way, okay?
God forbid you should lose somebody who is close to you in your life right now...but if you did, I'm sure you would discover in very short order that you are not "some twisted bastard"...
I think you're just being honest with yourself.
Oh, and 2nd on what Cadd said.