Whatever you do, I would make sure that you get enough reasonable training and experience so as to have some financial plan, or at least backup plan. That way, you can keep your options open and ensure at least some level of independence and self-sufficiency. Tap into the power and resources available to you, and use them to your advantage.
The ultimate outcome, theoretically, would be if your prospective fiancée could be persuaded to consider some objective factual analysis of the Watchtower organization so as to eventually discover and espouse the real truth about “the truth.” But, unfortunately, the chance of that is close to nil, as it usually amounts to nothing more than pie in the sky to expect a devout JW to actually wake up and see the light. All well. You can also keep your options open with regard to seeking a romantic and intimate relationship; i.e., the wonderful big world outside the little JW bubble.
Best of luck to you, in all respects. I know you might not want to think about this at present, but there is always more fish in the sea.