I would be concerned if hubby or boyfriend "didn't care." I mean, they SHOULD care, because any new relationships will impact them. Whether it's the sexual health of a FWB or integrating a whole new relationship into our lives, there are reasons to care.
Any dealings I've had with Protector Syndrome have been irritating and insulting. Tell me the truth and let me deal with the world as I see fit; don't spoon feed me the parts you think I can handle.
So, I will take a loving and supportive partner over a protector or someone who doesn't care, any day!
ETA: If there are spiders or centipedes involved, anyone is free to protect the hell out of me.