Dreaming about your girlfriend flirting with another man can evoke feelings of jealousy, insecurity, or fear of losing her. This type of dream may reflect your subconscious worries about your relationship or concerns about trust and commitment. It could also symbolize feelings of inadequacy or competition in your waking life, not necessarily limited to romantic relationships.

To interpret this dream further, consider the following:

1. Current Relationship Dynamics: Are there any recent changes or tensions in your relationship that might be causing you to feel insecure?
2. Personal Insecurities: Reflect on whether you have been feeling uncertain about your self-worth or desirability lately.
3. Trust Issues: Do you have any unresolved trust issues either from this relationship or past ones that may be influencing your feelings?
4. Symbolic Meaning: Flirting in dreams can sometimes represent a desire for more excitement or passion in your life or relationship.

It might be helpful to have an open conversation with your girlfriend about your feelings and any concerns you might have. Communication can often help alleviate worries and strengthen your bond.