My ex-friend keeps telling me she's better than me because a guy left me for her. How should I reply?

My ex-friend keeps sending me texts about how she's now better than me because a guy I was seeing broke things off with me and started dating her. She keeps gloating and even talks about their new sex life and how he lasts really long in bed with her. How should I reply?

My ex-friend keeps telling me she's better than me because a guy left me for her. How should I reply?
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