Sentencing Newland, Judge Roger Dutton described her as “intelligent, obsessional, highly manipulative, deceitful, scheming and thoroughly determined”.
He continued: “To successfully pass off a deception of this complexity was a major undertaking involving dedicated mobile phone lines as well as regular texts.
“You pursued this course of conduct over a lengthy period during which you played with her affections, acting entirely for your own sexual satisfaction and choosing to ignore the devastating impact that the eventual discovery of the truth would have on her.”
The judge said the psychological impact on the victim would be “severe” and “long-lasting”.
He added Newland’s behaviour amounted to “a callous breach of the trust that your friend had in you”.