Should I tell him I had an eating disorder?

If its something that you are over then it shouldn't be a problem. I would tell him but it shouldn't be something that slips into your everyday conversation. Wait until there is a moment of sharing personal secrets then tell him.

I wouldn't get too worried about it until you do get in a relationship. Then tell your boyfriend about it at an appropriate time. Its all behind you now, so I would think that any boyfriend would not even worry about it. There's no reason for anyone to hold it against you. You had an illness, that's all!

Honesty is always the best policy, but this isn't something he needs to know up front. As long as your eating disorder is a thing of the past, it's not something that can affect your relationship. If it ever comes up, don't hesitate to share, but if it doesn't, it's not important.

It really depends....If the boy really did love you, he would except it.
I probably would tell him.