I think the relevant paragraph for your question is this:
" Ichabod prided himself upon his dancing as much as upon his vocal powers. Not a limb, not a fibre about him was idle; and to have seen his loosely hung frame in full motion, and clattering about the room, you would have thought St. Vitus himself, that blessed patron of the dance, was figuring before you in person. He was the admiration of all the negroes; who, having gathered, of all ages and sizes, from the farm and the neighborhood, stood forming a pyramid of shining black faces at every door and window, gazing with delight at the scene, rolling their white eyeballs, and showing grinning rows of ivory from ear to ear. How could the flogger of urchins be otherwise than animated and joyous? The lady of his heart was his partner in the dance, and smiling graciously in reply to all his amorous oglings; while Brom Bones, sorely smitten with love and jealousy, sat brooding by himself in one corner."
And that the narrator tells us a lot of things about Ichabod, but in between the lines you get the feeling that his dancing is not sincere, just like his dancing, although Ichabod himself would probably argue. His love though seemingly deep is in fact a greedy sort of affection, like that he has for food (Katrina is a sort of a juicy morsel for him). He dances like St. Vitus (which is an ailment), he is the admiration of the outsiders ("the negroes"), and he is described a ogling. All in all, I would say the dancing and the loving are equally false.