So recently a girl im dating has been flaking/fucking me around so I have walked away. It was her birthday Tuesday and I messaged her happy birthday mate which she did not like. Her party is saturday which ill be attending and she just messaged me today saying I cant bring my friend anymore because theres too many people.

I dont want to cause any hostility as shes in my friendship group and ill be there Saturday but at the same time I want to show her that I dont care anymore and im walking away. Advice is welcome as to what to reply about rejecting my friend coming and how to act from here on. She always seeks validation so really focusing on removing that from my end