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A spurned MI5 spy stalked and ­sexually assaulted his secret agent ex-lover, a court heard yesterday.

The spook, on trial under the ­pseudonym Mark Barton, is also accused of beating the woman, known as 2363, during a four-month campaign of terror.

Only the judge, jury and lawyers could see Barton, 28, as the dock was screened.

Judge Alistair McCreath told jurors: “Hardly anybody in this room knows his name.

“You have been told it is Mark Barton. Actually it’s not – it’s a pseudonym.

"He is employed by MI5. The complainant in the case, 2363, is also an employee and so are loads of the witnesses.”

The court heard 2363 dumped Barton in June 2011 when he “lost his temper” after Rafa Nadal beat Andy Murray at Wimbledon.

Speaking from behind a screen, 2363 told jurors: “He was behaving like it was my fault I didn’t have passion about tennis and at least he had passion about something. I felt pretty worthless. I’d had enough.”

Prosecutor Alison Morgan said Barton then “embarked on a campaign to win her back” that was “persistent” and “amounted to harassment”.

The court heard it escalated until Barton barged into 2363’s home that October and ­sexually assaulted her.

He allegedly said: “We’re going to have sex and make up.”

He also allegedly attacked her at a bus stop and at her front door. Barton denies harassment, sexual assault and two charges of assault by beating.

The Southwark crown court trial continues.