@OneGreenPoster When a relationship turns sour, the party who had their head turned often rewrites the relationship roles. Their new love interest is the “rescuer”, the old one the “persecutor”, and they are the “victim”. It’s called the Karpman Drama Triangle, and I can see it playing out in your son’s relationship with his now ex-girlfriend. Tectonic plates have shifted behind the scenes and he is now playing catchup - poorly, I might add.
I am concerned about your son because he does seem to be a little immature, and has codependent tendencies. The panic proposal he made in response to to the girlfriend announcing her departure almost certainly elicited feelings of contempt towards him. I think he should have been prepared to have the courage of his convictions, and allowing himself to be browbeaten into doing things he is not 100% behind is foolish, but not an uncommon eventuality.
As for the girlfriend, well yes, she wears the pants alright. But I do not think she has acquitted herself well, either. Clearly her communication style needs work, but I have to ask myself whether this might be deliberate. Lack of candor is one way controllers exercise dominance since presenting decisions as a fait accompli keeps one’s interlocutors on the back foot.
I feel that if she had really wanted the relationship to work, she would have adopted a more constructive communication style.
Bottom line is, I feel the girlfriend wanted out and manipulated your son into a no-win position (the shit test).
That said, I think she has done them both a favor.