I thought, since Bella had been spending summers with him in Forks ever since he was a child, there could have been a bit more built up in their relationship.
They were both pretty reserved and quiet, but summer after summer might have built up something at least.
This was more a problem with the writing and character development, really. It seemed the characters were just born with the story rather than having had previous lives before Bella's arrival in Forks.
potterpuff @ lj