My girlfriend keeps complaining about her ex?

NotYourAverageGuy00
When we started dating at the time it seemed like she's happy with me everything is great, her ex is not on her mind, but then it started, she mentions him aloooot, not to compare or anything but to tell me how bad he was. I was cool with that at first but then it started annoying me, why is she stuck over him? she should just live her life right now and move on.
Anyway her ex is in her friends group and once a month it happens that her friends invite them both together even though they dont wanna see each other, everytime that happens he ends up leaving within 5-10 mins of arrival which is good i guess, but what also happens everytime he happens to be there is that she tells me "i wanna make him jealous, that im happy with you and stuff, i want him to know and make him feel bad" and i always reply with " no, let it go"
Which brings us to yesterday he said a couple bad things about her to her bestfriend and her bestfriend defended her and told my girlfriend what he said, so she gets sooo mad and riled up and comes to vent to me. She spent about 20-30 mins just talking with anger about him and how shitty he is and that she hopes he dies and stuff, I just sat there and didn't reply once.
she's happy with me, we barely fight, im not toxic like him, she opened a new page in her life, and it just feels so wrong and unhealthy that she keeps him rent free in her mind.
I know that she doesn't still have feelings for him, so my question is: i just want to know how do i make her get him out of her mind and shut the fuck about him? im sick of all the complaining about her ex.
To the ones wondering what he did,
he was toxic and made her limit friends for his insecurities, they fought a lot, and he shot his shot with the girl he told her not to worry about and got friendzoned.
He did not cheat, he did not abuse her.
My girlfriend keeps complaining about her ex?
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