Well do you know for a fact that she is bulimic or not. But it could be many things like a cyst on her ovary or something though cause I haven't had any tight pains in my stoach though and I have had bulimia for like a year in a half so if she is I don't think it is but maybe..... Sorry I don't hink I answered you question that well though

There could be a few things that are causing her to have pains in her stomach and its almost defiantly from making herself sick. She can cause alot of damage by throwing up and not just with her stomach. It could be an ulcer which is common with people who make themselves sick.
Have you asked her to get help, like see a therapist or something because its not a nice thing to have to live with and it does affect relationships. People who suffer from eating disorders can become issolated because they can become to controlled by their ed that they begin to push people away. That can be for a number of reasons and doesn't really have anything to do with the relationship its just there way of coping and not hurting people.
I am not suprised that she is having pains and i'm sure in time she could have alot more health issues as a result of making herself sick. It can affect almost every part of your body with time and so some people it can happen very quickly.
I hope that she is ok but if you have any worries or want to ask anything please don't hesatite to write to me and i'll do my best to answer any questions.

It could be a result of the ed. I suffered for many years with the ed, and am finally in a solid place in recover, and sadly, have longterm side effects. Stomach problems. I would encourage you to go a doctor who knows about the medical complications that ed's can cause. Also, to go to a doctor with whom you both feel comfortable, so that your g/f would feel comfortable enough talking about ed etc.