Wife never stopped having sex with her ex husband.

I married my wife Karen seven years ago, when she was 23yr, She had be married before at the age of 19yr, it did not last to long around 2 years but they did have a child a baby boy together. When I meet Karen the baby was 2yr old. We married 1year later and had a lovely wedding day.
After 2 years along came our first baby a lovely boy. As time went by I had started to notice that the two boys looked similar, but I did think that it was Karen’s genes being the stronger. I then started to notice that she was still very close to her ex Greg and I started to ask her was she having an an affair with him she told me not to be so daft.
Well after around a year Karen told me that she and Greg were lovers and always had been, also telling me that they had slept together the night before and on our wedding day once before the wedding and after in the evening telling me that on the big day she was full of his sperm, as I was a bit to drunk that night I just fell asleep and it was Greg’s sperm in her that night not mine. She had never stopped having sex with him, she even spent the night with him having sex on the night they divorced, continuing to have sex ever since 2/3 times a week. Karen said to me that she loved me but enjoys sex with Greg better and would like everything to stay the same with all three of us getting on. After a couple of sleepless nights thinking about where do we go from here, I decided that we would make the most of it and we should all be grown up about the situation after all Greg is the father to both Karen’s boys, I do accept that they are still lovers and Karen wants us both of us in her life and Greg in her bed. Two more years have gone by Karen has now had another baby with Greg a lovely little girl, I am very happy for both of them. Greg has now moved in with us, with everything working out well. Karen and Greg sleep together all the time now with me the next bedroom. I must say I do love it when I can hear them making love they would leave the bedroom door open so that can hear them having sex knowing he is filling my wife’s pussy with his sperm. I still buy her sexy items her to look good in the bedroom and have pay for them to go on holidays together, and I would baby sit their children I do love Karen and would never leave her. I know Greg is better in bed than I am he has a much larger manhood than me so meeting her needs. I know my place in our relationship he is her number one lover. Karen will give me a hand job telling me how good Greg is in bed and how he is giving her multiple orgasms, at times they would tell me to lick her pussy clean after they have had sex, when I had licked all his sperm out they would tell me to swallow it. Karen has told some of our friends all about Greg and that the children are his and that I am happy with that she has a lover. They just say if that’s what you want just do it a few of my mates have said that they would not want someone fucking their wife I have told them that I like the idea and i don’t mind.
If Karen ever want to have another baby with Greg I would be happy with it.