Hi worriedmama and welcome to bpdfamily
I am sorry all of this is going on. Your son has been with with his girlfriend for 3 years now, how did the two of them meet?
At what point did you start to realize there might be something wrong with his girlfriend's behavior?
Based on how you describe things, it seems your son's behavior has really changed since he's been with his girlfriend. We have an article here about fear, obligation and guilt (FOG) that you might find interesting. This is a short excerpt:
... .fear, obligation or guilt ("FOG" are the transactional dynamics at play between the controller and the person being controlled. Understanding these dynamics are useful to anyone trying to extricate themselves from the controlling behavior by another person and deal with their own compulsions to do things that are uncomfortable, undesirable, burdensome, or self-sacrificing for others.
Would you say your son goes along with his girlfriend and quite possibly lets himself be controlled by her out of fear, obligation and/or guilt?
You can read the entire article here:
Fear, Obligation And Guilt: How We Allow Loved Ones To Control UsI am glad you have the support of a therapist to help you deal with this difficult situation. I too think your therapist has given you some good advice, the situation still is challenging though of course.
You say your son doesn't see her for what she is, has he ever in any way acknowledged that there might be something wrong with his girlfriend's behavior? Do you perhaps feel that your son is in denial about her?
Take care