Hello and Welcome to the board. The people on this board are extremely nice. You'll find so much advice and information here. I totally understand what you are going through. I am in the same situation myself.
I've been with my bf for over a year and half now. He is not a witness, Yet. He has been studying with them and he beleives everything they say. It's a terrible situation and I wish it upon no one. He has pressure from his dad, because his dad is one,. My bf stopped attending meetings and things for me, but I know he is not happy with this. We have been going to a Christian church to try and see if something will work for him but it hasnt. He has begged me to go to meetings and even sit down with a jw for a bible study.
I have recently agreed to sit down with the jw for a bible study. Only because I have done my research and I know what kind of bs they pull, so I'm not afraid to be brainwashed. I'm also doing it to make my bf happy. Unfortunelty, I fear this will be the end of our relationship though. Even though both of us are madly in love with eachother and want to get married, it's not going to happen. Your bf has to be willing to change and explore other options. My was, but he still ran back every chance he got and that is why we have come to the breaking point in our relationship.
The best advice I can give you is to sit and talk to your bf about other religions and options. If he is not open to any, I would say break it off. As hard as it is and I know it is, you have to do it. I've put myself through misery and depression thinking I could change him and help, but I can't. It was just a matter of time until I realized this.
Good Luck
Meg