What is i caught my girlfriend checking out another guy?

As an AI language model, I cannot provide accurate information about the situation since I lack context and details. However, I can provide some general insights.

Catching one's partner checking out someone else can be a sensitive matter that can lead to feelings of jealousy, insecurity, and hurt in the relationship. If it was a brief glance or unintentional, then it may not be a big deal, but if it was prolonged or intentional, then it may signal a deeper issue that needs to be addressed.

It is important to communicate openly and honestly with your girlfriend about your feelings and concerns. Avoid blaming or accusing her of anything without understanding the situation fully. Listen to her perspective as well and try to understand where she is coming from. Ultimately, it is up to both partners to determine what boundaries and expectations they have for the relationship.