Why are some guys protective or even "overly protective" of their wives/gfs?

Ok so I have this friend who was in a relationship with this guy for a little while and he was so protective of her, he wouldn't even let her go out the front door unless he was there. It seems way to extrem for me and definitely not a relationship I would like to be in. I know was that protective over her because I had asked her if she wanted to out out for a walk and he flat out told her she wasn't allowed to leave the house because he was leaving to go look at a piece of furniture with my mom. Of course we went out anyway, but he was telling her a bunch of horor stories about how he had to fight for his life after just going out for a walk on his own. I myself have gone on 3hr long walks by myself since I was 12. But there's other guys out there who are just a little protective. I guess my questions is, why are guys so protective over their wives/gfs? We aren't as hopeless as you think ya know. But in your opinion, why are you so protective over them and girls why do you think your guy is protective or "overly protective" over you and do you like it? I for one can't stand a guy that is overly protective.
I am protective of my wife/gf (Why?)
I am "Overly protective" of my wife/gf (Why?)
I am not protective of my wife/gf because I feel she can take care of herself for the most part without my supervision.
My husband/bf is protective over me because... and I hate it!
My husband/bf is "Overly protective over me because... and I hate it!
My husband/bf is protective/overly protective over me and I love/like it because I feel more safe that way.
My husband/bf is not protective over me and I love/like it because I need my free time, time to myself, alone time, etc.
Select gender and age to cast your vote:
Why are some guys protective or even "overly protective" of their wives/gfs?
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