Rory. There is absolutely nothing to indicate her feeling anything for the Doctor other than that he's her best friend. There has been some minor misdirection in "The Impossible Astronaut"/Day Of The Moon, but it was clarified shortly after.
As pointed out elsewhere on this site, whenever any psychically enabled villain wants to give Amy the horrors, that villain always makes her see something nasty happening to Rory, not the Doctor. That alone is enough to answer the question.