You have two options
1. Run, run away from this relationship
2. Spend few months doing some thorough research, and then run away as far as possible from any relationship with men who belong to religions like these.
Well, there's a third one. Make him quit his religion. But on this point your chances are not good at all.
I am married to a good JW woman and I can confirm that what Carla says above is absolutely truth. And please don't you think that you will change your man after you marry him. He will dump you right away if you try it.