regularjoe said:

The love triangle was played up very, very much in a lot of the popular press in the late 70's - the 'who would Leia end up with?' question was there in a lot of the magazines I saw back then and Lucasfilm didn't seem to do a whole lot to discourage this kind of speculation.

I think most of the "love triangle" comes from the poster of Leia wrapped around Luke's leg. There is nothing in the actual film that points towards Leia having any romantic interest in Luke. Also LFL didn't discourage any ideas about it cause George had no idea what he would end up doing. Thank god he went with the obvious chemistry between Han and Leia.