Replying to My long distance relationship

I tried bumping an old ldr thread but nobody was replying. So...

About my long distance relationship. Im not sure what to do... This girl is a solid 8.5 (10 body), and shes crazy about me and wants to get married. I like her alot, but not as much as she likes me.
My whole life ive been the kind of person that didnt care about whether a girl liked me or not, if i wasnt totally into them then i ignored them basically.

But now i feel like if I broke it off with this girl it would destroy her; like literally she would be heartbroken. And i dont really want to do that to her, because (at least to me) she is the sweetest girl you will ever meet.

I would be happy if she moved to the us and got married- shes from a culture in which the male of the relationship is treated like royalty, and shes no exception.
any advices?