Why is my ex-friend rubbing it in my face that she stole my man? She tries to humiliate me in front of him even though he just chose her over me?

She tries to tease me about losing him to her, and teases me that she'll take all my future men as well just because she can. She even does it in front of him to humiliate me. What is wrong with her?

She's my ex friend already but we sometimes attend the same events because we're in the same social circle that's why I have to be around her.
Why is my ex-friend rubbing it in my face that she stole my man? She tries to humiliate me in front of him even though he just chose her over me?
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