As much as I like Peter and Harry's friendship I've never quite been able to buy that Peter would let a returned Harry off the hook for his posthumous acts as the Goblin nearly so easily as he did. I mean, sure, Harry doesn't remember, and he's back to his friendly old self, but Peter (not to mention MJ!) still remembers exactly what he's capable of. I can't imagine that kind of trauma being overcome with a brief period of anger, some soul searching, and a hug.