What a terrible Spider Man this japanese punk was.
Is not that he had amazing powers and didn't use them to save her, he refused to do so.
And it was him that made know the phantom tiger was generated from her, had he just been silent she would have lived, or in alternative tried to calm her, as he proclaimed it was subconscious from stress, she was in a bad period of her life, having someone to help in going through it could have been enough.
Peter is unlucky and does stupid shit at times, but this guy is on another level.