You have received good advice but I suspect you may at first want to make excuses for his unacceptable behavior with lots of 'Yes, but...'. Don't. You deserve to be the primary focus and interest to your guyfriend, not someone constantly begging to be recognized.
Even if he promises to leave the religion for you, don't fall for it. There have been plenty that have done that, only to return later, after being shunned by their JW family or feeling guilty for having left. If he doesn't leave for recognizing the religion (cult) is a sham for himself, he is too likely to return. You can't lead him away.
If a relationship doesn't progress to marriage within ~1.5 years, it is likely not going to. In your case, you are fortunate that it didn't as you now have opportunity to find someone deserving of you, without having to divorce or the complexities children bring.
I suspect that if you're honest with yourself, you came to realize before posting here that the future of the relationship is doomed, but was hoping that someone here would assure you that it isn't.