The single most helpful book I have read to date throughout my asperger's syndrome journey is "Boundaries" by Cloud and Townsend. The second is like it, but goes deeper, once a person is ready to go deeper. "Beyond Boundaries: Learning to Trust Again in Relationships" by Dr. John Townsend is worth adding to your bookshelf or Kindle.
It's rare for a Christian to be biblically counseled that it's okaynecessary sometimes to set strict limits on what behaviors one will put up with from a spouse, relative, coworker, or friend. When hurt becomes harm, it's time to set protective limits around oneself. Such limits may even mean ending the relationship entirely.