At the end of Chapter 7, we are witness to FW's thoughts (rare enough in JA to get the male point of view): Her power with him was gone forever.

Oh really?

He had a heart...for any pleasing young woman who came in his way, excepting Anne Elliot.
(If you say so.)

He obviously hasn't gotten over her, he "had never seen a woman since he thought her equal," and he has formulated what he wants in a woman on the basis of her merits (and supposed faults).

His actions towards Anne are a combination of coldness ("so altered he should not have known her again"; "I beg your pardon, madam, this is your seat"), kindness (his insistence on someone running ahead to notify the ladies of the cottage of his arrival), and even oblique reproof: "It was a great object with me, at that time, to be at sea....I wanted to be doing something."

It sounds like he's still angry, and hurt, and...more curious than he would like to admit.

I agree with others' comments that he would take Anne's avoidance of him to be an indication of her disinterest. She avoided him; and when he came to the cottage her reaction (as his) was merely polite, restrained. This is not the loving Anne he remembers. She obviously no longer feels for him! His coldness in Chapter 8, while in company at the Musgroves, is a reaction to this.