....falling for Fanny? We know he is a selfish flirt who thinks of nothing but his own amusement. He wants to make Fanny a little in love with him, basically because he knows she can't stand to be around him. But then as he takes the trouble to get to know her (while William is visiting), we get this from the ON:

Ch 24: "It was a picture which Henry Crawford had moral taste enough to value. Fanny’s attractions increased—increased twofold; for the sensibility which beautified her complexion and illumined her countenance was an attraction in itself. He was no longer in doubt of the capabilities of her heart. She had feeling, genuine feeling. It would be something to be loved by such a girl, to excite the first ardours of her young unsophisticated mind! She interested him more than he had foreseen. A fortnight was not enough. His stay became indefinite."