Sister still goes on about my ex!!

Long story short my oldest sister still goes on about my ex boyfriend and tells me things about him...thing is I haven't been with him for over 9 years, he is a horrible person than caused me a lot of damaged, I lost my confidence because of him, he was a control freak, always flirted with other girl, made me seem like the crazy one and well there more but can't go into too much. I have been with my fiance for 9 years (got with him not long after splitting with ex) and tbh I am so happy with him, my confidence still ain't 100% but its enough for me to have a happy life, but my sister doesn't understand all this she knows what he put me through and what he did to me but still tells me things about him, almost like she's trying to make me jealous, it's not working but it's just fucking me off since she should hate him or alteast know I hate him enough to not want to know anything about him, I have told her time and time again if she could stop but she still does, anyone got any advice really don't wanna fall out with her but feel she's not thinking of my feelings anymore, and that she secretly wishes I was still with this horrible person than with my current partner and she doesn't believe what he did to me