Why do some men not like their girlfriends wearing certain things?

lexit60
I have never really understood why some men want to control what their girlfriend wears, and why they get upset if their girlfriend is showing too much skin, cleavage, etc. If other guys see that your girlfriend is hot, and you are the only one that gets her at the end of the day, why aren't you proud? I am mainly looking for the opinion of men on this question, but girls: feel free to answer if you come across this and want to say something :)
Please be respectful in your responses, because I am genuinely curious as to why men think this way! It will help me better understand some men instead of immediately categorizing them as "insecure."
Why do some men not like their girlfriends wearing certain things?
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