Vivid Dream About A Relationship and a Baby Boy

I had this vivid dream about 1.5 months ago. After this dream, the guy and I gave it some try but it didnt work out because he wasnt really in it anymore. I'm currently devastated, trying to figure out where i went wrong and what i could have done better.

A guy that i recently broke up with and I were going home with our newborn baby boy. The “home” is an old apartment building, those flat that everyone's front door open to a shared balcony (i never live in one before but have seen some in the movie). We walked on this long open balcony to get to our home, i had a bitter sweet feeling in me, we walked side by side but we didnt speak a word while walking. I was the one holding the baby.
The interior of the apartment was pretty sad looking, the walls look like they need painting and furnitures were bare. There's a nanny waiting at home. When we got home, the nanny took over the baby, wrapped him up in a swaddle and start feeding him, while the guy handed me a pile of binders; he asked me to sort them out (he wasnt entirely warm nor cold), because we are moving into a new place in two months. I opened the top binder, looked at the handwriting and had a strange feeling, because it wasn’t mine or the guy’s handwriting. That handwriting and the stuff in the binder belong to my first boyfriend, i even found his name on the cover page.