My girlfriend doesn't like my mates girlfriend. What should I do about the tension between the both of them?

Hey. So my girlfriend doesn't like my friends girlfriend, they were pals at first. Like used to take my girlfriend to my friends place to hangout, but in January somethings were said (particularly from my friends girlfriend) to my girlfriends cousin (in which her cousin told my girlfriend and my girlfriend told me). My friends girlfriend said that i was abusive to my girlfriend, i swear at my girlfriend, she cooks for me, cleans for me and does a lot of things for me. It was said horrible what they said about us

my friends girlfriend has posted a photo of her youngest child on my Facebook wall and said i was its dad (im not) it did tick something off in my girlfriend (in which my girlfriend told me she dated a dude with baggage and it wasn’t great and she can't have kids). But my mates girlfriend has a bad habit of saying to me (while my girlfriend is around) “come and see your kids” (they aren't mine, they are my mates). I know my girlfriend deals with it by herself and doesn't tell me, she's always been like that though. I've upset her, but she doesn't talk about it, just deals with it on the inside.

My friends girlfriend and cousin did blame my girlfriend for saying horrible things about them, but I discovered it wasn't her. It was them bitching about me, my friend and my girlfriend (my girlfriend stood up for me and my mate) My girlfriend did confess to thinking my friends use me (which sounds fair from her point, as they only message me when they are short on Alcohol and cigarettes) and she doesn't like my friends girlfriend. My girlfriend will say “hi” to my mate, but his girlfriend she won't, if i do. My girlfriend walks past her like she doesn't exist, even if the girl is with her family. She walks past them all and ignores them, i have only brought it up to her a few times and i got the same response “i will say hi to your friend, but i hate her and her family, one day you’ll understand why. They are up themselves and trouble makers”. But what should i do?
My girlfriend doesn't like my mates girlfriend. What should I do about the tension between the both of them?
Post Opinion