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Hello, and welcome.
I can see both sides of this situation: on the one hand, why feel forced to hang out with a toxic person who makes you want to gouge your own eyes out? On the other hand, your girlfriend and your roommate still have the right to invite their friends to stay in their home as well.
You acknowledge that your girlfriend's friendship with this woman is important to her, so I don't get the impression that you want her to choose between the two of you. Since you clearly want to respect your girlfriend's wishes even though you still want to feel comfortable in the home you two share, this sounds like a situation that needs some compromise between the two of you. Since this woman is your girlfriend's friend and not yours, then I don't see why you particularly need to be involved in that friendship. At the same time, it sounds like this woman is going to visit from time to time, and will probably stay in your home when she does, and perhaps it would be good to talk to your girlfriend (and your roommate) about setting up some boundaries.
While I get why your girlfriend wouldn't want to sever a long friendship, what exactly does she feel about her friend's behavior? Surely she's noticed the toxic behavior, and surely it affects her. It sounds as though she's being used, and I have to think that she knows that. Does she have her own boundaries with this friend?
Hope this is helpful.
"Are tangerines really just oranges that didn't want it enough?" - Random Greeting Card