Dreams dictionary: Ex Husband / Ex Wife
Dreams dictionary: Interpretation 1
Specifically, to see your Ex-Husband/Wife in your fantasy shows that you are presently ending up in a circumstance that you would prefer not to be in. It recommends that you are encountering a comparative relationship or circumstance which makes you feel despondent and uncomfortable. On the other hand, imagining that you are as one with your ex/spouse suggests that you are subliminally rehashing the same old examples from that relationship to your present relationship. You are committing the same errors and responding the same way."
Dreams dictionary: Interpretation 1
In particular, to see your ex-husband/wife in your dream indicates that you are currently finding yourself in a situation that you do not want to be in. It suggests that you are experiencing a similar relationship or situation which makes you feel unhappy and uncomfortable. Alternatively, dreaming that you are together with your ex-husband/wife implies that you are subconsciously repeating the same old patterns from that relationship to your current relationship. You are making the same mistakes and reacting the same way.