What does it mean if you dream your boyfriend talking to his ex?

The first answer you probably thought of was that he must be cheating on you and your subconscience can see it better than you can. However, I think that the other female just represents something else in his life that you're not a part of. Is there something he does that requires more time from him than he is willing to spend with you? For example, does he play Video Games for hours even though you ask him to hang out with you? Many times we personify our feelings so if you're feeling neglected by your boyfriend, its very logical that that feeling will manifest itself into a female in your dream.