I had a dream last night that is really troubling me. I woke up very distressed and I have not been able to shake the mood all morning.

I was in a very serious and intense relationship for about a year. It was abusive mentally and physically. The things this man did to me were just very terrible and I could fill a novel with all of the bad stories. Somehow I still loved him intensely and there were good times. He was there for me when my father passed, etc... so I was very attached to him. He had to go out of state for the summer for an internship and within a week we split up.

I haven't seen him since early April.
But even before he left I was talking to another man. Him and I are now together and he is all I could have ever asked for. After being with him I don't know how I could have ever been with my ex. He is amazing and I've never been this happy. It is a complete 180. This man deserves only the very best from me.
I've kept in very minimal contact with my ex. I don't know much about how he is doing but I know he is returning to my state within a few weeks to go back to school. I know he is also seeing someone else who he just met a month ago and that there is a potential she will be moving in with him (from across the country) when he comes back.

Here is the dream: he had come back home and his girlfriend moved in with him. For some reason, in my dream, I lived in the same city (it even felt like the same house) and went to the same school as him. In real life I live 2 hours away (my current boyfriend however lives in the same city as my ex), His new girlfriend was lovely. He treated her much better than he ever treated me. However, he was still a jerk but the bad things he did to her didn't seem to bother her. It was like water off a duck's back and they seemed so happy together. This was maddening. I wanted them to be miserable like him and I had been. In my dream I really felt like I still loved him like crazy even though I do not and I know I ONLY want my boyfriend now. I kept trying to wake up from the dream and shake it off but every time I would fall back to sleep I would slip right back into it. It was so upsetting- even though- looking back at it now it wasn't that bad. However, the emotions it elicited were very intense.
I know there were a lot of details that I can not remember but there is something I specifically remember. It makes very little sense but in my dream it seemed to have great importance.
In the dream, it felt like the school and the house that him and his girlfriend lived in were combined. And since it seemed like I was going to this school I was dwelling within their living quarters able to observe everything. In the living room there were cubby like mail boxes for the students. I had one and so did my ex. However, he had cleared out one for his current girlfriend even though she was not a student. I remember in my dream that I removed her stuff and left and angry note in the cubby saying that this was a place for students only. It seems like such a stupid detail but I remember it reoccurring throughout the dream...

Like I said- it was not the events in the dream that troubled me but rather the emotional reaction I had to these minor events.
Does anyone know what this might mean?