I would sleep on it Wayfarer and think about what your goals are. What do you hope to achieve by “picking the boundary fight”? Personally, if I were you, I wouldn’t even let on that I had noticed he was gone. And I would double down on my GAL activities and stop checking to see what he is doing or not doing on SM. Honestly...why drive yourself crazy like that? And why should you have to explain where he is? I think he can explain that himself if your Ds want to know. If they ask you, you can be honest and just say he went out and didn’t tell you where he was going.
That look of shock on his face when he saw you and you just laughed and went to bed? THAT’s what you want. You want to challenge his ideas about you. Remember...he’s not doing this to get under your skin or expose you as a controlling person. He’s just doing what he feels like doing.
You set a March 1st date to revisit things. What can you do between now and then to GAL and do the 180s you need to do for you so that if he decides to ask you for a D, you will be in a better place to deal with it. That’s what you should be focusing on right now.
Sorry. I know this is hard. The more you can keep the focus on you and your Ds, the better off you will be. (((HUGS)))