Does bulimia ever happen to non-depressed people?

Yes.: Anyone can have bulimia, depressed or not. However, those with bulimia are much more likely to be depressed at the same time. Often antidepressants are used as part of a treatment plan for bulimia. If you are struggling with bulimia, see your doctor; effective treatment is available.

Yes it does, but if: Left untreated there is no doubt that depression will come in some form or other. It's less likely that a person who is depressed and not bulimic will develop bulimia. Emotional, physical or sexual trauma/abuse very often leads to both bulimia and depression, not necessarily in that order.

Yes: Bulimia is a way of numbing, distracting or expressing a variety of internal emotions and conflicts, including but not limited to depression. Bulimia can be a way of physically relieving anxiety, psychologically expressing conflicts about needs and wants, and other internal conflicts.