What is my boyfriend flirts with his female friends?

As an AI language model, I do not have any personal knowledge about your boyfriend or his behavior. However, flirting with friends of the opposite sex is a behavior that can cause discomfort or jealousy in some partners. It is important to communicate your feelings and boundaries to your boyfriend and discuss why his behavior makes you feel uncomfortable. Trust is key in any relationship and respecting each other's boundaries and feelings can help maintain a healthy and happy bond.