advice of those here that are telling you correct information.

Has he said he will marry you in Qatar? Or overseas?

That will be your first inkling of whether or not he is being honest with you....

If he marries you here, he will have to get all the correct permits, so then he might be talking honestly with you, BUT

if he says he will marry you in a foreign country, as in yours or US, then I am sorry, but don't trust that, since that marriage will not be legal in Qatar and you have no rights if he decides to leave you at any time.

Please be careful... I do know wonderful kind Qatari men, but unfortunately, a lot are only in relationships with Foreign women for one thing...

I know these posts are all sounding a bit harsh, but its reality here.