So, I have zero ability to compartmentalize. I feel all my feelings in real time as I move through my day and my life, and I gotta say, sometimes it's even a problem. I wish I could compartmentalize better for more focus and less mess during difficult times! But at least I feel my feelings.
I have one weird cheating/real life overlap example that comes to mind.
I have a friend (more acquaintance) who was a huge cheater in his dating years. Every girlfriend broke up with him due to cheating. He's charming, knows how to connect with women. One of his girlfriends gets pregnant, so he decides to marry her. She accepts his excuses when he cheats, so he probably felt safe with her. (He is addicted to the chase and capture. It is the clearest example of addictive cheating for ego kibbles that I've ever seen.) He knows that I don't agree with his need for the ego boosts of cheating, don't tolerate it, and think it's beyond messed up. But he's a denier.
He was talking to a girl at a huge birthday party for a friend of ours, talking to her for a long time. Lots of smiling. She went to the bathroom. I go over and say, "I can't believe you. Leave her alone. Don't you think about your pregnant wife?" His eyes flashed. It was like watching the compartment leak (leak out the ego high he was experiencing!). He said, "Diana isn't here, and I'm not doing anything wrong. It's not your problem to worry about."
His voice was cold and detached. If, and I believe he was, I pushed him into his reality compartment, in that moment there was no emotion there in reality. His wife and child were not actual people in the room with him, and they weren't being physically harmed. Cold detachment. Justification. A flash of anger to get me away from that compartment. It was creepy. It was robotic.
We haven't been very friendly since that night, just keep our distance these days. I believe this is why cheaters either do not discuss their families or do so with blame, anger, and negative comments. That reality compartment--and the feelings in that box--are painful reminders that they are doing something bad, that they should be ashamed, so their FOO grown psyche (just my opinion) takes over to protect them from those shameful feelings, the pain of actually considering the hurt or truth of what they are doing. In my view, it is done at a subconscious level, naturally and without thought like has been done so many other times in their life. This is how cheating or flirting is like a drug, not processed with consequences, needed to feel better, and not looked at through reality because the shame is kept elsewhere in the psyche.
If you ask me, using compartmentalization while cheating and admitting to it is a red flag of serious detachment and coping issues gone wrong. It shows an ability to separate from the necessary and self-regulating feelings of guilt and shame. Yes, those feelings had to be survived during FOO years, but now they need to be reintegrated for healthy living and decision making as an adult. If a WS says, "No, I never thought about you," they need to march into IC and ask why they are so good at putting away feelings and how they can get more in touch with their full palate of emotions. Asap.
Unless you revisit the toxic guilt and shame you have learned to compartmentalize and still compartmentalize whenever it shows up in your life, you do not know yourself at all. You are hiding from your true feelings about yourself and all that you do. Toxic detachment.