Should i be upset or moreso betrayed?

So heres the deal. i've been friends with this girl for the past 4 years ever since we met in college. We're very close and very alike. We used to live together last year and it was an amazing year for us. we never fell out and really enjoyed living together. However we didnt live together this year because she had to move in with a family member who she had already promised for just 1 year. I then moved in with another friend of mine, who is not as close to my other friend as I am to her. But me and my first friend used to always talk about how me and her were going to move in together next year since the beginning of this year. Me and the friend i'm currently living with now fell out a bit this year and aren't as close anymore. Although we are still "friendly" its not the same. My other friend is aware of the situation and continued to reassure me that i'll move out and go back to living with her. We had to choose our placements and she convinced me to choose the same place as her, which i did, so that we can again live together even though i dont really like the place i chose. I did it for her. Anyway today I find out through facebook that she's already making plans to live with our other group of friends, 6 to be exact, and not including me. I feel so betrayed and upset I dont know what to do. I guess i'll have to continue with my current living arrangements even though me and my current friend are not so close anymore. I don't want to say anything to avoid any drama, but i fel so betrayed :-(