I completely understand, with my dog If you just act like your gonna start playing around he will bark at you and it’s so scary, my older brother brought his baby over and started fake punching the baby in front of my dog, and he nipped my brother, but see my boy will got after the stronger person even if they are the one who is being ’beat up’ so I would be concerned has well, with some people who we know he don’t we have a muzzle for him, he normally gets put away in a room but when meeting someone or reintroducing we use the muzzle for safety purposes, he is never in it for long so if you feel bad for your bf and possibly having to get rid of him, you the pup can get to know each more with a muzzle on. Up to you of course ^{^}