When your girlfriend gets very close with another guy, play fights/chases him around, and constantly jokes with him, how should you react?

Its at a point where people we know make comments about how close they are such as “Aww you two having alone time”? Or “you two having fun over there?” Anytime they’re joking amongst themselves

When your girlfriend gets very close with another guy, play fights/chases him around, and constantly jokes with him, how should you react?
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