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We would keep the sitch from our son, and 'pretend' that we're the happily married couple.

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Hell she even said I'd be free to see other women.

Let me translate these two statements for you:

“I want to hide this from people initially because I don’t want to fully burn my bridge, and I want you to get on board with this so that I can tell people it was a mutual decision. If we do it slowly, I don’t have to take sole responsibility for it.”

“I’m already seeing another man. I’m encouraging you to see other women because it will make me feel better about my shi**y behaviour.”