You don't have to justify your actions to me. If you don't want to, then stop. Don't respond. I find it amusing when people air their dirty laundry in public and get upset when people react.
I think I've made it pretty clear that he bears his part in this. I don't understand why a man in his position would do such a thing. It defies reason. He has selfishly put the wellbeing of his wife and his children in harms way for a few hours of pleasure. He's at least as much at fault as you are. Still, you keep pointing at his culpability and trying to use it to dismiss your own. It doesn't work that way. You are responsible for your actions.
You knew you wanted to get pregnant. You knew that things would have turned out differently if you had been open about that. That is dishonesty. Not all of us are angels, and most of us are guilty sometimes engaging in dishonestly from time to time. However, it's different when it comes to life changing events, such as having a child. You owed him and your future child a frank and honest discussion about your intentions. You denied him that discussion. You denied your child a relationship with a father. You wanted a baby and it didn't matter to you how it affected others.
You’re right though, you don’t have to justify your actions to me, but what about your son? What will you say to him? Will you be honest about your part? Will you demonize his father in order to exonerate yourself? Do you think he will buy it?
You claim that gender equality is relevant, but you failed to explain how.