Boyfriend and my friend? :(?

If he can be all buddy buddy with a girl then you can sure be all buddy buddy with any guy you enjoy talking too. He has no right to tell you who you can't/can speak too hun. Unless you don't see him saying "I love you" to this girl or that this girl isn't saying anything disrespectful about you and your relationship then you can't tell him not to speak with her either. You both have to trust one another to be yourselves around everyone and be 100% faithful to your relationship. I hoped this helped a little, GOOD LUCK!