He says it was self defence
She later met Simpson by chance and they began dating.
But the eight-month relationship ended when, Jeanette claims, he punched her after a family party, leaving her with a black eye.
The Crown Prosecution Service did not prosecute because 5ft 10in, 13st Simpson claimed he acted in self-defence after 5ft 1in, 9st Jeanette hit him.
A CPS spokesman said: “There was insufficient evidence to disprove the suspect’s version of events that he was acting in self-defence.”
But he was dismissed for “discreditable conduct” after an internal disciplinary hearing by Northumbria Police.
Jeanette, 46, of Newcastle, said: “I’m very pleased he’s been sacked.
“I was in a very vulnerable state when I met Des. He came across as a good, trustworthy man. But if you can’t trust a police officer, who can you trust? I let him into my life and regretted it ever since.”
Divorcee Simpson, 45, started spending most of his time at Jeanette’s home soon after they met.
In June last year, Jeanette threw an 18th birthday party for her son Jordan, where Simpson drank heavily.
Jeanette said: “He started shouting at me about a night out I’d been on. It had all been completely innocent.”
Jeanette says the next thing she knew she was nursing a black eye.
She alleges the officer of 22 years dashed downstairs and slashed his left wrist, spraying blood round the house — before bandaging the wound with Jeanette’s clothes.
She says Simpson was arrested in the morning, after her son returned and called the police.
Simpson declined to comment.