I got a new roommate. My old roommate was in her parents car, and they even said goodbye to me. I didnt know whether she was going to a new dorm or just going home. I didnt know why I was getting a new roommate. I was excited at first and text my high school friends about it. But when I met my new roommate, I realized that we werent that alike. So I was sad and missed my old roommate.
The fact that you missed your roommate in the dream shows that you obviously do like your roommate a lot. The fact that she left in your dream could mean that you subconscoiusly feel a strain in your relationship, that there might be some problem between the two of you that you need to work out.
Still, your relationship with your roommate is so strong that you fear that living with anyone else would be disappointing, as evidenced by your lack of excitement upon meeting your roommate.