PC Louretta said that Mick Philpott kept saying that he wanted to have regular contact with the children he had with Ms Willis and he wanted a '50-50' split in terms of access to them.
The jury heard that whilst inside the house, Ms Willis had agreed to allow Mr Philpott access to the children.
On the night in question, the officer said Mr Philpott had calmed down and was the 'dominant force' in the conversation while Ms Willis appeared quiet and calm. He added that Mairead Philpott was also there but said nothing.
PC Louretta said Ms Willis later left with her belongings and the children's clothes.
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Speaking exclusively to ITV News, Dawn Bestwick said jail wasn't good enough for MIck Philpott and that "as a coward" he "deserved to die".
The events that eventually led to parents Mick and Mairead Philpott and friend Paul Mosley's conviction of manslaughter.