I'd say he more likely isn't being protective of you, but of himself. He's probably insecure from the move, doesn't know why he's with these strange people, even though they are very nice to him. It'll take him a while to put together that he can trust you to protect him, and that he doesn't need to be nervous or on edge because you can and will keep him safe. He's probably also was not very familiar with proper leash training and regular long walks full of lots if rich exposure, like I'm sure he's getting now. It'll come with time.
Morgan Lynn - GSD - 15 months - Herder in Training
Emma June - Husky - 18 months - Daddies Lil Girl
Asker Lynn - Pit Mix - 11 years old - Snuggle Buddy