When with his friends, my boyfriend doesn't treat me like his girlfriend...?

you deserve some more girlfriend like affection. try reaching for his hand or kiss his cheek. maybe he'll take it as a hint like hey remember me im the girlfriend. if he doesn't take the hint then you could always say something to him. bring up something someone said about you guys not acting like a couple and how it aggravated you when they said it. hope i was of some help. good luck.