Olga,
He is right, there are certain rules for Qatari's to follow. But he can still get married with you, although u wont have exactly the kind of life u have right now after getting married and becoming Qatari, but then thats just ur business. I know quite a few people who have married a non Qatari. As far as I know, he isn't even allowed to have a girl friend, so if he has one, then he just needs to convince the ministry of Interior to get married to u. By the way, I am not sure if you will have to convert to islam (if u r not already).

fear karma, it bites u in the butt.