bitchin ex

So last year I talked to this girl which is my boyfriend's ex. I told her to stop talking to my boyfriends family members (just so you guys know they aren't close and the girl wasnt introduced personally to them its just like she was mentioned to them and the girl added them on facebook) and she agreed. I told her not to talk to them cause the way she talks to them makes me so uncomfortable for she feels like she's still one with the fam (even though she never was) My boyfriend and I have been together ffor 3 yrs now and theirs lasted for just 3 effing monts and she acts this way? Im sorry for the rant but here is the problem, even though I already talked to her and she agreed, I found out that she never stopped. I mean, oh common. She and my boyfriend are done so why still do that? I can understand if she became close to them before.. BUT THEYRE NOT. What should I do with the girl?Y