I'm in a similar boat to you. I've been dating an unbaptized JW for a few years now. He's kind of a different case, though. He's never been fully convinced of it, he doesn't think they're infallible at all, he only started going when his mother did (he was 12 or so), his congregation is fairly open, his family knows about me and I've met them all, and none of his extended family or his dad are JWs. He even has a few baptized younger friends who know about me. Since he's not the brainwashed type or anything, I really think there's a good chance he will leave. He's said a bunch of times that he doesn't think he could get baptized because he doesn't want to be disfellowshipped if he decides to leave. He also openly admits the problems they have. His main thing just comes back to "they're the only ones who preach and are really living right." It's totally not true, and I've gotten him to concede a few points, but meh. We also have Bible discussions fairly regularly, and while he doesn't believe Jesus is God or divine, he admits my viewpoints have scriptural backing. And he's gotten to agree with me about disfellowshipping being wrong.
With the two of us, though, we're young enough that I'm not immediately wanting marriage. I think people should wait til at least closer to 30. Those marriages tend to last longer. And while we've never given each other an ultimatum, it's well known that if we don't end up seeing eye to eye on religion, we won't get married. He's basically my best friend, though, so I don't mind sticking with him a few more years even if it doesn't lead to marriage. And I would TOTALLY recommend coming to this website and looking at the sheer insanity anytime you think of becoming a JW or at least tolerating the lifestyle. Or just read their literature. It's not the same as a Catholic marrying a Baptist or something. Heck, even Mormons are more open minded. It is a completely different lifestyle, and one that's marginally cuckoo. The people may be lovely, but they're encouraged to lead a life that's not all that lovely. If you need anyone to talk to and commiserate over your predicament, feel free to PM me anytime.