I'm actually on the other side of this -- I've not been eating, for personal reasonsi'm not gonna talk about, and my boyfriend has been great with it -- if you dump her, it will do nothing to help, it will probably only make her feel worse and make her food complex worse -- she'll feel, no matter what you say, that you broke up with her because she got really fat and didn't look nice anymore, or that you thought she was insane or that you simply don't care. Everyone else -- my mum, one of my sisters, my neighbour, my friends at uni -- have started to notice that somethings up with me, but my boyfriend is the only one who encourages me to eat, and is, i feel at least, the only one who cares.