Dr. Nicky...
Is he supposed to be so incompetent or just flat out bored with his job that he couldn't figure out that Joe was lying about his identity?
The number of parallel events between the relationship Joe described, and Beck's would surely seem too much of a coincidence. Especially after Joe said his partner was cheating on him with his therapist.
Also, Dr. Nicky could have easily stumbled upon a picture of Joe if he ever searched Beck's social media. Although, maybe he only contacted her over the phone or via text, and had no interest in her personal life.
I would have liked to have seen a confrontation between him and Joe.