I would be surprised if the therapist flatly told gf “That’s unhealthy.” Good therapists don’t typically give firm answers, they help clients figure out their own answers. Here, at a minimum, the therapist must realize that there are two sides to the story.

If you were to see her therapist, which I doubt will happen, the therapist would not take a position absolutely contrary to hers. If that happened it would be the end of gf’s trust in the T.

Have you discussed your potential compromises with gf? What does she say?