Awwww...he's a cutie. We had a girl cat that needed to know everything I was doing and she'd try to figure out how things worked. Had to watch her every minute...thank goodness for her frequent naps! We called her the "Snoopervisor!" Still miss her. To be on the safe side, you might ask your vet about your boy cat's personality change. Most cats mellow after being neutered (you probably know that).