My friend is causing my eating disorder to come back help

I made what I thought was a best friend in my first year of uni. She was very like me down to earth and normal not shallow or looks obsessed and we got on great. I introduced her to my male flatmate and the three of us became best friends, were living in a house together next year. Over the first year it was clear that my friend fancied my guy friend she started wearing loads of make up and basically not eatin to loose weight. She is pretty but she also knows it and loves herself. Im the complete opposite looks wise shes small framed skinny and very girly, im very tall and quite athletic figured as I compete in a competitive sport so im not hench but im very toned so im not a skinny size 6. She started putting me down constantly about my looks, commenting on my hair or my skin or how I do my make up what I wore she basically implied id never be as pretty as her and I always felt ugly and inferior in her presence. It has only recently got worse when she started going on about my weight im a size 10 I have put on weight since uni but she constantly makes little digs. She would always give me more dinner saying 'its clear I eat more ' or im a fatty, when we went to the shops shed tell me that a dress that suited her wouldn't suit me because im to big. She constantly goes on about her weight and how slender she is. I suffered from bulimia when I was in 6th form and ended up in hospital because of it I lost about 3 stone and looked a state, ive put on weight and im a healthy size but im not skinny but ive always been body conscience. A few weeks ago she told me she was scouted to work for Hollister telling me that 'they only choose very attractive girls' that the guy said she had model potential and that they wouldn't ever look at somebody of my size as they want slender girls. This has made me really insecure about my weight to the stage that within three weeks im becoming obsessive about my weight Im terrified of falling into this eating disorder again. I go back to uni next week and im dreading seeing her with her making all this snide comments I don't really know what to do or how to handle it but I don't want to let it get to me and end up with an eating disorder again Help please

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