How my husband became a cuck. [wife] [pregnant]

Me and my husband have been together since high school. He’s the only man I’ve ever been with before all this. But we have two kids together. After our second child he decided to get a vasectomy. Which he says he still doesn’t regret having. After a couple years of him having the procedure I began to want another child. I thought it would just be a phase and I’d get over it. I was wrong. It kept growing and I wanted another one more and more. I mentioned it to my husband and of course he couldn’t do anything he was just like well who knows. After several months of me mentioning it to him several times he started saying things like find a boyfriend that looks like me and we will tell everyone my vasectomy failed. I figured he was joking until i asked him one day. Would you really be ok with me having a baby by someone else. He said if I really wanted another child it could be talked about since he couldn’t help me. So I thought about that and a few weeks later I confronted him and told him that if he was serious I’d like to look for a guy. He said ok and we began looking. We scoured the internet and had several good conversations and lots of bad ones. lol. But we fell on to a guy we both liked. He looked similarish to my husband and he was a great guy. So we went out on a few dates with him and everything was great. After our third date we sat down and talked and made sure we wanted to go through with this. We both agreed that we wanted to. So we told the guy and planned out the process. We started tracking my cycle for the next month and when the time came we called him and invited him over. We decided for me to see him several times in about a week span for optimal success so we did. We now have a 3 year old from him and since then we’ve continued having casual sex and at the moment I’m pregnant with another child of his. My husband has said several times he never expected to enjoy seeing me have sex with someone else and loves seeing it. We are both very happy.