nothing will change until your son is ready. and that is his call only. he may know deep in his heart she is not right but until he is ready all the harping on it, talking, and even insight from a psychologist isn't going to be the push he needs. he is a parent...to push him into making a decision is as wrong as you feel he is in making him stay. it is a call only HE can make, and whatever call he does make, you aas family need to abide by it or leave him alone