He sabotages any chance he can for you to have a personal relationship with anyone on his side. He is building a wall between you and his people. This is a surefire way to lose a girlfriend IMO.

A partner is someone who at a minimum has your back. Your boyfriend is not meeting the bare minimum requirements of even a basic friend.

A life of your (future) husband shit talking literally you to everyone who will listen does not sound like a future. It sounds honestly really lonely.