To your edit, you can get a pt that doesn't work for the gym. Look in your local and find a pt that's a woman and get her to meet you at the gym of choice. That could be an option. That doesn't solve your boyfriends either insecurities and/or control issues though. If you feel comfortable with a male pt then you should be able to go exercise and train without your boyfriends possessive interference.
That’s a decision only you can make. But I wouldn’t tolerate that behavior.
Thank you I’ll think about that if I can’t convince him on therapy
To your edit, you can get a pt that doesn't work for the gym. Look in your local and find a pt that's a woman and get her to meet you at the gym of choice. That could be an option. That doesn't solve your boyfriends either insecurities and/or control issues though. If you feel comfortable with a male pt then you should be able to go exercise and train without your boyfriends possessive interference.