He needs rehab for being an obnoxious, sex-crazed pathological liar. She needs rehab for being delusional enough to think he'll ever change.

there msay be reasons other than trying to save a marriage that the injured spouse works with rehab. it may be that she herself needs to understand why and how. not to "save" the relationship, but to move forward with her own life.working thru this can strenghten her own resolve,rebuild her own sense of self worth and give her a better grasp of what she needs to protect herself in future actions.forgiving and moving on is more benefical than sense of bitterness and failure within yourself.