Come on Jack, you don’t do that to your girlfriend! It’s humiliating and manifestly unwise. You can’t compel your girlfriend to be friends with your female friend. It’s an asinine demand. You’re going to start a civil war. Women are territorial. Your girlfriend naturally claims her territory. And in case you don’t know her territory is you. That includes all your associations, the parameters of your physical movement, to the exclusion of any predator or pretender.