A question for those who finished Harry Potter 7....*spoilers*?

YAY!!!! HE LIVES!!!!!! So does Hermonie,Ron, and Hagrid!!! :D My favorite characters!!! I wish that Dobby, Fred and Lupid didn't die though...I liked them too...I like Snape now. Pity Rowling couldn't show us that he was a good guy earlier...anyway, now for my question: Ok so the reason why Voldemort couldn't kill Harry the second time is because Harry wasn't afraid of death...or was it because Voldemort killed his own piece of soul and not Harry's??? I'm a little lost on that part of the story...