I am sorry this idiot treated you like that. It's a cult. Your boyfriend is being manipulated by a cult. They believe they are the only true religion and that the world is ending soon and anyone that is not a JW will die. They practice shunning and anyone who engages in sex outside of marriage can be disfellowshipped and shunned. This creates havoc in the life of anyone that gets involved with a JW. They may have fun outside of their rules, but inevitably they feel guilty and go back or get caught.
As hurtful as this is, you are probably better off without him. Unless you were to convert he will probably not want to marry you and you do not want to convert, trust us on that. Your boyfriend does not know it's a cult and will probably deny that it could be, so chances of him leaving are not good. The Watchtower would always be the third wheel in the relationship.
Anyway, if he dumped one girlfriend for you he would probably have eventually dumped you for someone else, so he was probably not the one for you anyway. You would probably be better off with someone that does not have all this baggage.