Is it okay that my girlfriend has a streak on Snapchat with another guy that I know?

We’ve been dating for almost a year and I noticed yesterday that she has a streak with this guy that I know that goes to her college, lets call him Mike. They seem to be friends but I don’t really know what they’re snapping when I’m not around. Her and I love each other very much but I can’t get rid of the worrisome feeling. What is okay and what is not okay?
Is it okay that my girlfriend has a streak on Snapchat with another guy that I know?
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