If a girl is known to be a man stealer & will do everything in her power to maintain the satisfaction of keeping my exs attention. What should I do?

So even though she don't want my man. She likes the idea she can take him from me. & I feel like she'll constantly "compete" with me forever just to maintain that satisfaction. She is known to "take" her friends men.
If a girl is known to be a man stealer & will do everything in her power to maintain the satisfaction of keeping my exs attention. What should I do?
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