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 
okay necessary 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. 
And that's okay, too.