The England ace, 33, bedded Becky Milne, 26, after Saturdays singer Una, 36, had their second child.
The love-rat scrummed down with blonde Milne until 4am after a boozy party.
But news of the affair got back to Saturdays singer Una who dumped him and called off a move to the US.
A source close to Becky said: “They once went to a very drunken party with some of Ben’s rugby pals and she ended up romping with him until 4am.
“Becky told a friend about her fling with Ben. She swore her friends to secrecy but the news slipped out and Una found out all about it.”
“Apparently, Una read all of Becky’s and Ben’s messages.”
Ben 33, and Una were married in 2012 and have two children, aged six and three.
They were planning to move to the US, where he is to play for a team in New York after ending his career with Premiership side Northampton.
But, as we revealed on Saturday, she ended the marriage when she confronted him about his cheating.
Becky, whose dad runs a PR agency, lives in a modern £350,000 four-bed house in Northampton.
Her £30,000 Range Rover Evoque, complete with the number plate BL09OND, was parked on the drive yesterday. Becky’s Instagram page is full of photos of her in sexy poses in bikinis and skimpy dresses.
She also posted pictures while watching Northampton games in 2015 during her affair with burly back Ben, who was capped 34 times for England.
Last night, she was wearing a tight, white T-shirt and leggings, with her platinum blonde hair tied up in a bun.
She smiled and told us: “Ben has been friends with me for years, so I’m fully aware of what’s going on.
“I’m aware that Una is making a statement, I spoke to her last week.
“I won’t be releasing a statement to anyone and I won’t be talking about anything.”
Meanwhile, Irish-born Una and her children have moved in with her mum in Thurles in Co Tipperary.
It is understood Ben still plans to travel to New York.
The split came as a surprise as they were pictured looking loved-up at a friend’s wedding just five days earlier.
Una also posted a picture of the pair together on his birthday and included a kiss.
Last week, a friend of Una’s said: “She had become suspicious about Ben’s behaviour. Then enough was enough and she just confronted him.
“She has now decided it’s over. She’s utterly heartbroken and devastated but she’s very traditional in her outlook.
“She thought their marriage would be forever but can’t see a future for them any more.”
Una’s spokeswoman confirmed the split and Una’s return to Ireland last week but insisted: “There will be no further comment to make.”
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