The Jungian method of interpreting dreams would look at the symbolism associated with the dream of your ex co-worker. After identifying the characters, elements, and feelings associated with the dream, it would look for meaningful connections related to current life issues. The dream could be an indication of unresolved issues with your past relationship with your ex-co-worker, or it might signify a need to obtain closure or develop a better understanding of the relationship. Jung's method could also suggest that the dream may be a symbol of something else in your life, such as needing closure in other areas of your life, or a desire for something that was lacking in the past relationship.