Married 45 yo wife

Our friend's wife had left him and needed a shoulder to cry on. And that happened to be my wife. He would call round most days for tea and sympathy . I would be at work and when I got home I would learn he had been round again. I was beginning to get bored with that and suspicious. One day I decided to phone her just to see if she was OK. But no reply. I tried several times during the day but she didn't answer. When I got home I asked her why she hadn't answered my calls. She said sorry she had been busy. I asked her if Chris had been around again. And of course he had. She'd been talking to him most of the day. I said is there something going on between them and she said nothing. She said nothing happened. He wasn't her type even. This situation continued for several weeks and I got more and more suspicious. She was going on walks with him with our respective dogs. Going to his house as he owned woods where they could take the dogs. Eventually I came home one day and confronted her. I got quite upset and she continued to deny anything was going on and she calmed me down and we ended up fucking. I asked her how she did it with him Chris. She said she didn't. Nothing happened. And then she said is this my punishment fuck. I don't know why she said that.
Anyway he kept coming back round so I decided I had to trust her. After a couple more bust ups between us she went round to his to tell him they couldn't meet anymore. He called me a control freak but if she fancied a tumble in the hay anytime the call.
And that was that. Though from then on she would bring her legs up higher when we had sex. I commented on it but she just said I thought it would be better for you.
She maintains to this day and it was 15 years ago nothing happened. But I still think something did happen and I begin to imagine them on the couch in our living room. Her green summer dress undone and her knickers on the floor and his cock pounding her wet swollen hairy pussy . Her legs right up in the air as he hammers her. Then she cums and he shoots his load right up her unprotected pussy.