It was arrogant behaviour. Did he believe it was risky? He told Julie it was the "perfect crime." In his eyes she had nothing on him, until it slowly dawned on him she was going to be a problem.
I don't think he was even worried when she went to the police ( from a gulit stance )
Doesn't seem flustered from the interview transcripts, many consider him evasive, but he remains fairly cool and confident throughout. Heavily riding on the " I left her so she made up bullshit agenda "
He attempted to send Julie a letter with sarcastic overtones " hi stinker"
Even when arrested at Dover weeks later and charged, he was all smiles
Even through the trial he was apparently very confident, Edmund Lawson QC recalling him discussing his prospective newspaper deal as the jury were deliberating, It's obvious he thought he was getting a not guilty.
I think reality only hit home the first time when he would have been in the holding cell after being found gulity and given life with a 25 year recommendation.A source saying he broke down screaming " no no no "
But even then by all accounts he regained composure quickly, and told Rivlin about his intention to appeal.