dating and guy friends

Michelle
I have been dating this guy and he hates the fact that i have guy bestfriends....says if we actually become offical i can't talk to them.  i have had guy friends all my life aside from my few best girlfriends. All of my guy friends are literally like my older brothers! I could never think of them in any other way!!!! 
The point is why do guys hate that i have guy friends and why do i have to change that? If i have a boyfriend? Advise please?