There is something deeper going on, and you have to become aware and accept your feelings, and understand these deep things about you.
It may have been a short chapter in your life anyway, maybe not even that important after all, more usually inflated by planetary positions, karma, traumas, problems, etc., which make us think that the whole thing has a very big value, often to escape from something else.
But in any case, the important thing is to understand oneself to an honest degree, to improve where possible and to get on with one's life, free and light.
I am writing this from my own recent experience, I used to dream about this person a lot, but these dreams are actually just confused shadows and nothing more.
Chasing them is just a waste of time, and in reality there are no well-founded reasons why I should invest in that person.