Please interpret this female behavior?

This girl is all about her friends. Puts tons of energy into being popular and current with a wide variety of old and new friends. I spend years on the top of her list while we are in a long distance relationship. Then we move in together and I'm suddenly on the bottom of her list. She goes out of her way to bluntly make it clear to me that anyone else has priority. She runs hot and cold like someone with a split personality. One minite she is tearfully declaring that I'm the love of her life, the next she says I'm just her roomate and anything I don't like is my problem. Unfortunatly I'm in love with her. Also if it matters I'm much more physically attractive than she is. What's going on?