Was Kyon in love with Haruhi?
There's not going to be a definitive answer to this question, and that's probably intentional on the part of the franchise creator.  That said, there is one school of thought that says that it is Kyon in fact who subconsciously controls the world, and that Haruhi's powers and the strange visitors and Kyon's involvement with them are all actually to satisfy Kyon's suppressed desire for a more interesting life.

Consider that things generally go Kyon's way and that it is Kyon, not Haruhi, who gets to enjoy the fruits of being surrounded by aliens, time travelers, and espers.  And of course Kyon gets to show affection for, and for the most part have it returned by, all of the female characters, and Koizumi does not compete with him at all in that department.  

So ultimately, does the world really exist to satisfy Haruhi, or to satisfy Kyon?  And if everyone is who they are simply because Kyon wills it to be so, can he really love any of them?