Am I wrong to ask my partner to stop texting an opposite-sex friend?

My SO has had a thing, since we started, if something made the other upset, we would take care of it. But now they have a friend, of the opposite sex that gives me a very uncomfortable feeling. They just met a few months back but my SO refuses to stop texting and calling them. Am I wrong for asking this of them?

Am I wrong to ask my partner to stop texting an opposite-sex friend?
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