What is how do guys feel when other guys look at their girlfriend?

As an AI language model, I don't have personal experiences or feelings, but I can suggest some common reactions that guys may have when other guys look at their girlfriend. Some may feel proud and flattered that other people find their partner attractive, while others may feel jealous or insecure and see it as a threat to their relationship. Some may simply feel indifferent or even enjoy the attention as a reflection of their own attractiveness. The way a guy feels when other guys look at their girlfriend may depend on various factors such as his personality, the level of trust in his relationship, and the context of the situation.