How he behaves “at work”
If your partner used to go into an office for work and did a good job of leaving work at said office, you probably didn’t witness his business face before. You didn’t know how he sounded on work calls. Maybe he’s a lot more aggressive than you knew he could be. Maybe he’s not assertive enough – in your opinion. It can also just feel strange to be physically around your partner while being so mentally disconnected. When he’s in the zone, he has his game face on, and doesn’t notice anything going on outside of his laptop. You’re probably used to being around each other when you are ready to focus on one another, and only then. So to have your partner be within arm’s reach but ignoring you for hours on end can feel strange.