I Lost Someone Important to Me

I hate all the soft terms for it. My grandad didn't 'pass away', I didn't 'lose' him; he died. Pure and simple. That was on Wednesday, 5th July 2017. Two days ago. And although I was there when it happened, and I was sobbing so much, I felt so much grief when they took off the machines and I saw him flatline, now I feel nothing. Except it isn't nothing, it isn't the numbness that a lot of people feel. It's literally that I just don't feel sad. I feel all other emotions, I'm completely normal. I just don't miss him, and I'll be laughing with friends at school and forget he ever existed. I'm not sure why that is, and I so desperately want to miss him, I don't know why I don't. It's actually scaring me a bit how little I seem to care even though he meant everything to me when he was alive.