Girlfriend keeps bringing up her ex. What should I do?

Okay, so I’m going to keep this short and to the point. I’ve been dating this girl for about 4 months now and she keeps on bringing up her ex. She brings up bad stories about him and says she’s glad that’s done, but then she brings up memories of them together and laughs. This hurts me because I know that if I were to bring up stories of women from my past she wouldn’t like it. It also hurts me because I know he wants her back and that he’s had sex with her in the past while I haven’t (I’m a virgin). The cherry on top is that I know that he treated her not very good and I’m doing my very best to treat her right and I’m getting done like this :(. I’d go to the moon and back for her but she keeps bringing him up.

Also keep in mind, I started dating her when she was coming off of a breakup with the guy. Thank you for taking the time to read this and have a blessed day.
Girlfriend keeps bringing up her ex. What should I do?
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