Is it ok for your girlfriend to message another guy, while y'all are together?

So i was with my girlfriend today and noticed she was texting this guy. Telling each other what they were doing, she didn't say she was with me but everything else she had done and was doing.
I don't think she knew i seen them texting, should this be a concern?
Is it ok for your girlfriend to message another guy, while y'all are together?
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