You mean you are in love with Qatari national, is it? and he wants to marry you.
1st: make sure he is not already married here in Qatar.
2nd: are you both of same religion? You may need to convert to Islam before getting married
3rd: Does he have permission from his government to marry a foreigner? Believe me, he needs one for your marriage to be valid and recognised here
4th: Are you ready to sacrifice your career for this?
5th: Qatar is an Islamic country. Women need to dress here modestly. See Qatar guide at the top of the page to get an idea about dressing.
6th : there are few colleges here for you to study but make sure he will allow you to study as you have mentioned he doesn't want you to work after marriage
7th : Be careful and make decision wisely
All the best