Most Helpful Guy
If a girl told me that I'd ask her why she doesn't want my girlfriend to come. After she explained I would decline, cause if she dislikes my girlfriend that much, I don't need to have any relation with that girl.
She may also be planning on fucking me or something, and nope, I'm not a cheater.
Most Helpful Girl
i'd go have a word with her. & slap that bitch. lol jk but i think the girl has feelings for the boyfriend... if i were the girlfriend i'd make my boyfriend stay away from her. but usually it never works cause the boyfriend will think that girlfriend is freaking out over small matters & it will make him cold towards girlfriend because he'll think she's a jealous freak. so what you have to do is show the other girl that boyfriend loves girlfriend more. probably by doing sth like actually showing up to the party with boyfriend :P