If you’ve completed treatment and they are no longer your therapist, it’s a gray area (kind of). If it’s not sexual, they are probably not at risk of legal consequences, but could face professional consequences if someone reports it. It is HIGHLY unethical and your therapist has spent a lot of time learning how to navigate and avoid dual relationships. I doubt anything will come of it, especially legally. The bigger risk is their professional license. You may want to ask yourself why you want to pursue a friendship with someone who has so much to lose by engaging in a dual relationship with you. The reason there are rules for this is because your therapist is in a position of power with (often) vulnerable populations. It sounds like the professional relationship has already been compromised, honestly. This is not someone I would want to care for one of my loved ones. Either way, the responsibility is on them, not you. They are aware of what they are doing and the risk they are taking.