Melanie – The first step in understanding why you are dreaming no stop is that he – your ex – was your first experience of a relationship that lasted any length of time. As such there are enormous amounts of experience and learning that took place in those years. You learnt about the twists and turns of love, and the pain it could cause.
So do not think you are dreaming of your ex – you are dreaming of all the experience and learning he represents, and your dreams use his image to play this out. And of course his fiancé is also a depiction of your feelings about the situation. So instead of saying I dreamt of my ex, you ought to say, I dreamt of all the negative and positive things I learnt, or are still digesting about the relationship.
Why you are only now dreaming about him depends upon how you feel and how you see him.
Tony