A helpful article
The support of a spouse is one of the most valuable resources an individual with bulimia can have available to them. If you have never struggled with an eating disorder, it can – at times – be confusing and frustrating to understand.
When someone we love is sick, we want to know why and what we can do to help them, but with an eating disorder, there is no single cause or cure. There are, however, ways to help your partner, and strengthen your relationship, by coming to terms with the condition. As a spouse, educating yourself about the facts is an important first step in understanding and caring for someone struggling with bulimia.
Source: When Your Spouse Has Bulimia