This is the thing about psychopaths,they're usually serial killers. ?
Jeremy wasn't shy. He had an out-going personality.
He didn't appear to be the inferior one in the relationship. Far from it, the way he splashed the cash to show his status as having the money to do so.
He didn't display violence towards Julie,or she wouldn't have stayed with him. Remember the time when he raised his hand to her and she threatened to phone the police ?
He didn't show anger,and so far as I know,it hasn't been reported while he's been in prison.
You can't compare this twisted individual to Jeremy.They're two entirely different characters altogether.