Why Everybody is pre-judging this guy?
maybe he is in love with her ... really,
a qatari man could marry a non qatari woman, but, she should be the second wife.. which is not easy for somegirls, but it is ok for others,
i think women like men with money, villas, and annual expensive vacations.
as a lot of Lebanon ladies, you can be wife number 2, have fun and nice easy life, and in case you want to play around, you can find another ( when he got no time for you ).
as somepeople was telling you, there is a local usage to marry only a local, this usage became a low,
you can travel with him to Eygpt and marry him there.
you should not convery to Islam only to marry him, it is not necessary.
for sure his family will accept you more if you are converted to Islam, but it is not a valid reason.
anyway,
i cann't see a reason you want to marry him? i think you are engoying each other no ??
love is a big lie, don't belive in it , else, you are scrowed.
if love is true, then Why he should go against his family ? why don't you accept to continue like this ??
i think the answer is cuz you want to be more secure, you want to marry cuz you want to be secure with him.

i'm i right ?
maybe you will tell us later