One of the methods of control is to enforce confession of intimate matters to destroy the privacy boundary. To a non-JW what happened between you and your fiancee is a matter for the two of you only. Even if you are not ready to leave the religion you should insist to your fiancee that what goes on between the two of you in your relationship is not a matter for the organization or its functionaries but is only for the two of you and that is non-negotiable. Ask him whether he would like to invite the GB into your marital bed? If he will not accept that there are intimate areas of your life in which the organisation cannot intrude then run the other direction fast.
My JW wife was df'd because I impregnated her out of wedlock. She only confessed when her belly became too obvious and then when she repented after we got married to get reinstated I think (hope) she kept her confession to the minimum required for the purpose and event though I question her loyalty sometimes I have absolute confidence that she would not disclose anything intimate to the elders. I am also pretty sure that she has not disclosed to them how much of an OPPOSER I am for fear of the problems that might cause.