Which of course creates a mystery as to why he would reveal to her every step of his murderous plan don't you think?
Jeremy would tell anyone that would listen about the raw deal his family gave him.
Julie was the closest person to him, so would have been on the receiving end of his rants. Even when the relationship was in decline.
It does seem strange that Julie should be rang at 3am & 5am on the night, when the relationship had been in decline for 9 months. But Jeremy made the calls & testified the relationship was in decline.
I suspect Julie being whisked over was so Jeremy could keep an eye on her. Ignoring her and she may talk.
Threads already created on why he told her and was whisked over.