
Andy Smith told how Dawn, 34, and long-lost son Ben, 18, both admitted the affair to him in messages sent MINUTES apart.
And he revealed he first suspected something was going on between the boy and his stepmum when he caught them CUDDLING on the sofa not long after Ben - who he hadn't seen for 17 years - moved in with them.
"They have ripped my world apart," said Andy, speaking for the first time about his nightmare.
"I've looked after and loved Dawn for years and she's just used me as a walking wallet. And Ben is just a chav waster.
"When he needed somewhere to stay, I offered my house to him and he repaid my kindness by running away with my wife."
Andy, 38, also revealed how Dawn took their three children with her - and how their seven-year-old son told him: "Dad, I've seen Ben and mum snogging naked in bed."
The shattered kitchen fitter was out shopping when his phone went off and his world came crashing around him.

He recalled: "The message was from Dawn about Ben. I opened it and it read, 'I'm sorry Andy, I love him'. I couldn't believe it - my stomach was churning.
"And then within minutes I got another text - this time from Ben. It said, 'I'm sorry dad, I love Dawn'.
"It confirmed my worst fears - they'd been at it for months. I went straight home but they'd gone and taken my three kids with them.
Now Andy rues the day he brought Ben back into his life. He had left Ben's mum for Dawn when the youngster was just 18 months old and had no contact with him. But Dawn was a dinner lady at Ben's school.
"She used to come home and say what a good-looking lad he was when he was about 15," said Andy.
"Then she persuaded me to get in touch with him as he neared his 18th."
So Andy contacted Ben on social networking website Bebo. "We had an emotional reunion - and he was having problems at home so a month later he moved in with us."
"He's not the brightest lad - but I persuaded him to enrol on a sports and leisure course at college so he could make something of his life."
Instead Ben was about to make something of Andy's wife at the family semi in York.
"I noticed that Ben and Dawn seemed almost unnaturally close but I just put it down to being a close stepmum and son relationship," said Andy. Looking back maybe I should have realised something was going on, but it's so ludicrous it doesn't cross your mind. I remember on one occasion I had gone up to bed but they were still downstairs in the living room at 4am.
"I went down and they shot apart. They had been in each other's arms. He had a guilty look all over his face and I just knew something was going on even though they were both clothed.

"I confronted them but Dawn started shouting at me and just said, 'you're disgusting, as if I would do anything like that, you're sick'. She kept repeating the word 'disgusting' - she was furious. After that I never mentioned it again.
"On other nights they would go out clubbing together. Looking back, it was obvious but I couldn't believe anything was happening."
After they'd ran off, desperate Andy managed to contact Dawn on her phone. "I tried to reason with her, begging to see my kids, but she just said she wanted a divorce and wanted to be with Ben.
"She came back once to pick up her stuff. I spoke to my young son and he told me he'd seen Ben and his mum snogging naked in bed. I was furious that a seven-year-old had seen this. It's the ultimate betrayal."
Dawn and Ben have now moved to "start a new life" in Lincoln but they still they continue to haunt him. Earlier this year jobless Ben sneaked back into Andy's home and helped himself to holiday cash his dad had saved. He admitted stealing £150 and York magistrates ordered him to repay the cash and do 60 hours community work.
Meanwhile Dawn plagues Andy on the phone.
He said: "I have had constant abusive texts from her and she has turned up at my house demanding to be let in. She has my new partner's number and has been texting her lies about me.
"It's like she doesn't want me, but doesn't want anybody else to have me. What she's done is evil.
"As for Ben, is there a worse way a son can treat his father? I don't know how he can live with himself after he's done."
matthew.acton@notw.co.uk
This article has 9 comments
The son has revenged on behalf of his mother and is now the stepfather of his stepbrothers.
Disgusting.
By Emmanuel Okumu. Posted October 31 2009 at 6:00 AM.
What a sad stary. The Ultimate Betrayal. How can he betrays his old man like that!! It would never even cross my mind!!
By zakes. Posted October 31 2009 at 1:32 AM.
That lad must be desperate, running of with someone twice his age and certainly triple his weight. What is the world coming to.....
By Steve. Posted October 25 2009 at 6:59 PM.
Although the wife should have known better the dad has hardly been father of the year and if he'd been in constant contact with his son his son would have behaved differently towards his stepmother.
There is the same age difference between my husband and me as there is between his eldest son and me and I have never seen my stepson as anything other than one of our kids and never would, to me its very sick that a woman would take advantage like that but then he was hardly a 'son' as she'd only known him since he was grown up, his dad has to take some responsibility for all of this!
I'm sure though he'll be looking for someone more his own age before long, shes hardly a glamour girl!
By Emma. Posted October 25 2009 at 6:19 PM.
Quite a disturbing story but i am sureit will have happened many times before. In my opinion it wont last 5 mins. Young boy gets seduced by older lady. Getting a bit of experience while the wife gets what she has missed out on. It wont be long before the son starts looking for a sleaker, more streamlined model with better looks.
By Contentious. Posted October 25 2009 at 12:15 PM.
Other side is in the Sunday Mirror where Ben and Dawn speak. Funnily enough it doesn't mention half of the above.
By Bemused. Posted October 25 2009 at 11:58 AM.
Well said English, that was my thoughts exactly. This man is a poor excuse for a father and has only himself to blame.
By RMD. Posted October 25 2009 at 11:14 AM.
Typical loser for a father. Before slagging off your Son, you might want to try looking in a mirror, hardly a role model in his life, well unless you were trying to show him how not to be a dad.
By Carol. Posted October 25 2009 at 11:02 AM.
"As for Ben, is there a worse way a son can treat his father? I don't know how he can live with himself after he's done."
While I wouldnt wish this on anyone, but its not like you have been much of a father after walking out on him and his mother at 18 months old. You never saw him again untill your wife convinced you to do so. Not sure how you can call yourself his father, and I wouldnt be surprised if Ben doesn't feel like he owes you too much.
By English. Posted October 25 2009 at 1:33 AM.