It can certainly mean what you interpreted.
Personally tho, the Judgment card for me presages the end of a cycle, the penultimate card of the majors that advices you to take heed of what you have experienced and to learn from your mistakes. The 6 of Cups stand for sweet and nostalgic memories, and that is precisely what they are - just memories. It seems like what is keeping you from moving on is the remembrance of the better moments you shared with your ex.
Maybe it's best if you take note of the things that have brought you to this impasse, the core reasons why you broke up, and objectively ascertain for yourself if you both truly have a realistic chance of making it last if you do decide to give it a another try. But as they are, the cards do not suggest a reconciliation in the offing.