This is only what happened to my cousin but years ago she dated a Muslim guy. Same situation as yours. He was from a wealthy family, bought her a car, bedroom furniture etc, and slept overnight with her at my Aunt's. They all thought it would lead to marriage BUT his family were totally adamant that he only marry a "good Muslim girl". They totally rejected my cousin. She even tried at one time to show up, unannounced, at a family thing and the mother of the son threw a royal fit. They broke up shortly after that because he told her he had to go along with his Muslim family's requests. Oddly enough, he shortly later dated my bosses daughter. Same thing, young, blonde girl. WHen I figured it out, I told my boss and sure enough, same scenario, bought her lots of "things" but eventually dumped her. A few years later he married a "good Muslim girl".

Not saying this is what would happen to you but just be prepared.