My boyfriend thinks i'm anorexic... what can i say to convince him otherwise?

to me, it really sounds like he's just concerned and worried for you, and that's actually really sweet. I know it is probably very frustrating for you to have to hear things from him about it all the time, though. Sit down and talk to him about it. Tell him that him constantly telling you things like make you feel bad, and it hurts your feelings. Other than that, just be as healthy as you can around him, and stay positive. It sounds like he really cares about you, and that's a good thing!