In your dream, the guy represents a part of your personality. It is an action or behavior that you have been doing. The other girl in the dream symbolizes a certain way you think. As you get to know each other, and he breaks up with his girlfriend shows that you have been doing something for a particular reason but now you are doing it for another reason. Look over your life and see where you have started something, and after awhile, you grow to like the activity and change your mind in favor of it. An example could be: a person joins the soccer team because a friend asks her too. After playing for a time, she actually begins to like playing and plays harder and learns more. Hope this makes sense to you. God bless.