Do I have an eating disorder?

So I went out to eat breakfast with my boyfriend. I ordered a rediculously huge meal and he said if I could possibly eat that all then he's gonna start calling me *Carley (she's a morbidly obese woman...her name is changed for private reasons). I laughed and jokingly said "Youre going to make me have an eating disorder" He said "dont you already have one?" So I asked him what he meant and he said "Well, I've noticed that everytime you eat you put ur hand over your mouth or something over your mouth to like....hide." And I had never noticed I do that before until he said something about it. I do it frequently. I catch myself doing it all the time now and the funny thing is i've tried to stop but for some reason I can't. If im eating something with a fork I'll put my elbow on the table and put my hand, holding the fork downwards towards my food, infront of my mouth. I used to not be able to eat infront of guys and I thought I had gotten over that. Idk if I'm over-reacting or if i should seek some counceling. Help?