He never took their arguments seriously like now that he thought it was your tantrum and then you would come back to him. He wasn't jealous but when he saw your closeness with Nanami when they were fighting, he would give any man the pass to get close to you.

When you were alone in the living room he didn't see a better opportunity, he closed the door and took you by the waist "Are you going to keep trying to get my attention or should I remind you who you belong to?"