Is it okay for your boyfriend to talk to his ex girlfriend? Even though she cheated on him several times. And they're texting in secret. Please comment and rate

Silvia
I recently found out that my boyfriend has been texting his ex girlfriend. But like I said she cheated on him several time. And I found out they've been texting secretly. He claims they're just friends. But I'm not comfortable. What shoud I do? I told him to stop. He promised yesterday but he didn't keep up with his word. 

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