Addressing the roots of this, without baraging her with your worries, sounds like a path to take. I say, addressing it without bringing her your every worry because you've already told her, as much. And to avoid pushing her away, taking a solid look at where this comes from with a counselor, friends, support group, or even researching articles and literature would be wise. As you've mentioned, if this should ever come up again in the future.

Certain things, could be in evaluating your internal needs in a relationship. Is anything lacking? Are you getting more attention than others? Etc...