This entire forum, and a hundred like it, are dedicated to help people trying to recover from experiences such as mentioned above, just by letting people talk about what they've gone through trying to get out of it...and also people come here for support while they are trying to get out of it.
2 things I notice about your questions is that you don't like people knowing all your business, and you don't like cult like mentalities. That's what this particular religion is SO like. I know the person studying with you must be really a nice person. Most of them are really good people. It's just that this religion that controls them can also make them like heartless robot like creatures when the circumstances change.
I grew up witness, and because I decided to change my religion and become just a regular Christian, I lost my family. Not because they wanted to, but the organization tells them that they shouldn't speak to me.
I would be be very nice to this person that has been studying with you, but tell them this is not for you. They will try to gloss over things and make them seem rosy, but believe me, this is real.