I loved that Jared was flawed. It was so much more different then Edward and the Cullens (because they were protrayed as perfect and impossibly beautiful) that it was nice to see flaws in one of the main male characters who was one of the love interests. (Which includes Wanda's Ian too.)Wanting.an.Edward wrote: He honestly beleived that he would never lose Mel, that they would always be together even after the end of the world and when she was taken away it utterly shattered him and he became a differant man. not someone who was happy and smiling but someone so close to being cold. to him she was dead and that killed a major part of him. That just shows how much he loved her.
Hmm..."Wanda's Ian"...that sounds nice.
Could totally make a fanfic out of that. 
Anyway, the nastiness was a bit shocking after Mel's loving memories of him but as the book progressed he became somewhat of the old Jared, changed and shaped by his experiences. It was a slow gradual change, which made it at the same time believable.