Do I tell my boyfriend?

I had an active eating disorder (purging) for about three years, but was finally able to mostly control my behavior. About a year and a half after I stopped purging, I met a guy, and we have been in a steady relationship for about two years. I've never told him about my eating disorder, and it makes me feel like I'm hiding something. I would really like him to know about this part of my past. However, I'm worried that if I tell him, it will throw our relationship off balance and he'll feel like he has to stay with me to help me be stable. I don't want him reading into comments I make and worrying that I'm sneaking around purging-- at this point, I've learned on my own how to control my behavior. Also, I'm worried that he will be upset that I waited so long to tell him. Do I tell him? Have you told partners about your eating disorders?