I need help, Is hanging out with other dude cheating? I don't know if my girlfriend is manipulating me or not need suggestions?

So at the beginning of the relationship i told my girlfriend not to meet other guys, today i found out she met some dude 2 weeks back that she hid from me. On asking she accepted that she met him. What should i do, she’s like really sorry for what she did
I need help, Is hanging out with other dude cheating? I don't know if my girlfriend is manipulating me or not need suggestions?
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