Should I end the friendship?

Okay so my bestfriend & I have been bestfriends for about 5 years, there's this girl that I have majorrrr problems with, I don't hate her, I just dislike her, (all good reasons) and well about 9 months ago MY bestfriend stabbed my back, and she took part in that girls sayings & rumors about me, she never told me what this girl was saying when she knew what was going on. & well I dropped it because I don't hold grudges, but my bestfriend is always bringing her up around me, telling me things about her (nothing bad, just normally talking about her) and tbh I find that so disrespectful... do you guys think the same???? Like we could be hanging out, and she'd say something like "omg I miss her" and it bugs me, not of jealousy, but annoyed. It's pretty fucking annoying,