So there are a few issues here.
He grew up a witness which means in maturity he will be way behind other men of his own age - proof is the hour long crying show.
His family obviously want him to get baptized and he is under pressure to do what he is told.
He wants you in his life but that will only be allowed if you become a JW.
The fact that he had sex with you is a big problem which is only tolerated by his mother due to the fact that he cannot be excommunicated at this point because he is not baptized.
You will forever be a reminder of his error and trigger of guilt for him and therefore this relationship cannot last.
You DO NOT want to be a JW.
Your only course of action is to end it unless you love him enough to give up your entire way of life and become a good house wife, a yes woman, in subjection to this immature man as your head, giving up your own family and friends and never again make a decision without asking what "the organization" has to say on the matter.
I've said it before, I say it again - run away, change your number and be happy, single and free.