My girlfriend broke up with me because she wanted to date someone else that she was already friends with.
Dreams about relationships ending can often represent real life anxieties or fears about losing someone you care about. However, dreams also often exaggerate feelings, and can sometimes be an outlet for processing emotions that we may not be consciously aware of.
In this case, the dream may be reflecting a fear or insecurity about being replaced or feeling inadequate. It's possible that you are concerned that your girlfriend may be more interested in someone else, or that you worry that you're not good enough for her. Alternatively, it's possible that you're still processing the emotions and feelings associated with the breakup in your dream.
It's important to note that while dreams can be informative, they don't necessarily predict the future or reflect reality accurately. If you're feeling concerned about your relationship, it may be helpful to talk with your girlfriend or a trusted friend or therapist about your feelings and concerns.