Welcome CW02,
I was 21 when I went through this - he didn't tell me he was a witness until after we'd been dating for a while. He wanted me to convert of course, and I couldn't - we argued scripture constantly, faught over our beliefs and made each other miserable. He wanted to get married before he got baptised so they wouldn't be able to disfellowship him for it. His friends in the 'Truth' were miserable to him, using emotional blackmail to hurt him. His family wasn't in the 'Truth' so I didn't have that added pressure, but he thought of his congregation as more important to him than his own family so their opinions mattered more to him.
In the end I walked away. I thought I was giving up the love of my life forever - and a year later I met someone who could put me first, shared my belief system, and didn't have to lie to anyone about our relationship. We've been married 10 years and I know I did the right thing.
My advice would be to save yourself - get away while you still can. If you love him tell him to give you a call when he's free of the Watchtower then go live your life and don't expect to hear from him. If he has to choose you over his family and his faith the guilt will be unbearable and you will be in the middle. His family will consider you the cause of his problems and they will likely never accept you, that's no way to have a relationship or a marriage.
Please keep us posted, and I hope you are able to make the decisions that will be best for your future. Please read the stories people have posted here and think long and hard before you make any decisions that will change your life.
Good luck,
Silverleaf