"You get involved, possibly married and all of a sudden, your dear darling sweetheart flips the script and is trying to get reinstated into a world of crazy you did not sign up for."
There is, of course, no way you can anticipate that. The temporarily banished JW has no real dating or relationship experience. When things settle down, they face losing their family and any friends in the cult unless the "repent" and "return to Jehovah." Of course, this is not what you signed up for, but, unfortunately, you feel the effects of a cult you never joined.