What should I do if my girlfriend doesn't listen to me when I tell her to stop doing something.

Anonymous
my girlfriend continually talks to her ex-bf even though she hasn't seen him in almost a year. I've asked her to stop talking to him but she just says I can't stop he's my friend you wouldn't understand. It really makes me angry and I just don't know what to do anymore.
What should I do if my girlfriend doesn't listen to me when I tell her to stop doing something.
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