First learn more about Islam.Then yes,its true,to stay in a Islamic Country like Qatar is maybe not easy for you in the beginning.But with his help you will make it.And please visit Qatar to be sure you will like it to be here.Maybe in Poland he was more free and open minded but back home now he has to respect the Qatar and Islamic rules and laws and so maybe he would be not the same person like he was in Poland.I dont hope so but it can be.Yes,think very serious about it and make sure how much you are ready to give up for him and to be with him
All the best and good luck.