My boyfriend has an eating disorder?

I believe my boyfriend is having a relapse with bulimia/anorexia. He looks really ill. He said he's been dieting lately. But it looks like it's been going on for a while. He came over for dinner today. He ate very little and immediately excused himself to the bathroom. The sink came on before the toilet was flushed. So I think he's relapsing. Is he.... Or am I being paranoid? He does get sick a lot so maybe he was just not feeling well.